circulation - birdi.ctu.edu.vn€“ supplies oxygen for cellular respiration and disposes of carbon...
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Circulation
Gas Exchange
Obtaining Nutrients
Waste Disposal
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Bui Tan Anh – College of Natural Science
• Transport of gases, nutrients, and waste products.
• Transport of processed molecules.
• Transport of regulatory molecules.
• Regulation of pH and osmosis.
• Maintenance of body temperature.
• Protection against foreign substances.
• Clot formation.
Function of Bloods
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Bui Tan Anh – College of Natural Science
Blood Compositions
• Blood consists of:– A liquid matrix called plasma
– Formed elements
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Bui Tan Anh – College of Natural Science
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Bui Tan Anh – College of Natural Science
Constituents Major functions
Water Solvent for carrying other substances
Ions (blood electrolytes)SodiumPotassiumCalciumMagnesiumChlorideBicarbonate
Osmotic balance, pH buffering, and regulation of membrane permeability.
Plasma ProteinsAlbuminFibrinogenGlobulin
Osmotic balance, pH bufferingClottingDefence
Substances transported by bloodNutrients (Glucose, Fatty acids, Vitamins)Waste products of metabolismRespiratory gases (O2 and CO2)Hormones
Plasma
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Bui Tan Anh – College of Natural Science
• Red blood cells, or erythrocytes– are by far the most numerous type of blood cell
• Males have about 5.4 million red blood cells per microliter of blood
• Females have about 4.8 million/µL
Red Blood Cells
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Bui Tan Anh – College of Natural Science
Shape and Dimensions of a RCB
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Bui Tan Anh – College of Natural Science
SEM of RCBs
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Bui Tan Anh – College of Natural Science
• White blood cells, or leukocytes, are clear or whitish-colored cells that lack hemoglobin but have a nucleus.
• White blood cells:– protect the body against invading microorganisms
– remove dead cells and debris from the body
White Blood Cells
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Bui Tan Anh – College of Natural Science
• White blood cells are named according to their appearance in stained preparations.
• There are five types of WCB:– Neutrophils
– Monocytes– Basophils– Eosinophils– Lymphocytes
White Blood Cells
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Bui Tan Anh – College of Natural Science
Neutrophils
• Have small cytoplasmic granules that stain with both acidic and basic dyes.
• Their nuclei are commonly lobed, with the number of lobes varying from two to five.
• Seek out and phagocytize bacteria, antigen–antibody complexes, and other foreign matter.
• Secrete lysozymes, which are capable of destroying certain bacteria.
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Bui Tan Anh – College of Natural Science
Neutrophils
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Bui Tan Anh – College of Natural Science
Eosinophils
• Contain cytoplasmic granules that stain bright red with eosin, an acidic stain.
• Reduce the inflammatory response by producing enzymes that destroy inflammatory chemicals like histamine.
• Release toxic chemicals that attack certain worm parasites such as tapeworms, flukes, pinworms, and hookworms.
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Bui Tan Anh – College of Natural Science
Eosinophils
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Bui Tan Anh – College of Natural Science
Basophils
• Contain large cytoplasmic granules that stain blue or purple with basic dyes.
• Contain large amounts of histamine, which they release within tissues to increase inflammation.
• Release heparin, which inhibits blood clotting.
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Bui Tan Anh – College of Natural Science
Basophils
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Bui Tan Anh – College of Natural Science
Lymphocytes
• Are the smallest white blood cells.
• The lymphocytic cytoplasm consists of only a thin, sometimes imperceptible ring around the nucleus.
• They play important roles in immunity
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Bui Tan Anh – College of Natural Science
Lymphocyte
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Bui Tan Anh – College of Natural Science
Monocytes
• Are the largest white blood cells.
• They phagocytize bacteria, dead cells, cell fragments, and other debris within the tissues.
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Bui Tan Anh – College of Natural Science
Monocyte
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Bui Tan Anh – College of Natural Science
• Platelets (thrombocytes) function in blood clotting
Platelets
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Bui Tan Anh – College of Natural Science
• Base on their morphology, identify each of the white blood cells.
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Bui Tan Anh – College of Natural Science
• New blood cells are continually formed from unspecialized stem cells found in red bone marrow
Hematopoiesis
– Stem cells differentiate into red and white blood cells and the cells that produce platelets
– Bone marrow stem cells can be isolated and used to treat leukemia
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Bui Tan Anh – College of Natural Science
• In the human cardiovascular system
THE HUMAN CARDIOVASCULAR SYSTEM
– The central pump is your heart
– The vascular system is your blood vessels
– The circulating fluid is your blood
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Bui Tan Anh – College of Natural Science
• The three components of the cardiovascular system are organized into a double circulation system:– The pulmonary circuit carries blood between the
heart and the lungs
– The systemic circuit carries blood between the heart and the rest of the body
The Path of Blood
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Bui Tan Anh – College of Natural Science
(a) Pulmonary circuit (b) Systemic circuit
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Bui Tan Anh – College of Natural Science
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Bui Tan Anh – College of Natural Science
• The human heart is a muscular organ about the size of a fist
The Heart
– It is located under the breastbone
– It has four chambers
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Bui Tan Anh – College of Natural Science
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Bui Tan Anh – College of Natural Science
• If the heart is the body’s “pump,” then the “plumbing” is the system of arteries, veins, and capillaries
Blood Vessels
– Arteries carry blood away from the heart
– Veins carry blood toward the heart
– Capillaries allow for exchange between the bloodstream and tissue cells
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Bui Tan Anh – College of Natural Science
• All blood vessels– Are built of similar tissues
– Have three similar layers
• Structural differences in arteries, veins, and capillaries– Correlate with their different functions
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Bui Tan Anh – College of Natural Science
From heart
Epithelium
Smooth muscle
Connective tissue
Artery
Arteriole
Epithelium
Capillary
To heart
Valve
Epithelium
Smooth muscle
Connective tissue
Vein
Venule
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Bui Tan Anh – College of Natural Science
Blood Flow Velocity
• Physical laws governing the movement of fluids through pipes– Influence blood flow and blood pressure
• The velocity of blood flow varies in the circulatory system– And is slowest in the capillary beds as a result of
the high resistance and large total cross-sectional area
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Bui Tan Anh – College of Natural Science
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Bui Tan Anh – College of Natural Science
Capillary Function
• Capillaries in major organs are usually filled to capacity– But in many other sites, the blood supply varies
• At any given time, about 5–10% of your capillaries have a steady flow of blood running through them
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Capillary Function
Capillary
Red blood cell
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Bui Tan Anh – College of Natural Science
• The walls of capillaries are thin and leaky
– As blood enters a capillary at the arterial end, blood pressure pushes fluid rich in oxygen, nutrients, and other substances into the interstitial fluid
– At the venous end of the capillary, CO2 and other wastes diffuse from tissue cells and into the capillary bloodstream
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Bui Tan Anh – College of Natural Science
Tissue cell
Arterial end of capillary
Diffusion of O2and nutrients out of capillary and into tissue cells
Diffusion of CO2 and wastes out of tissue cells and into capillary
Interstitial fluid Venous ends of capillary
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Bui Tan Anh – College of Natural Science
• Two mechanisms regulate the distribution of blood in capillary beds
• In one mechanism– Contraction of the smooth muscle layer in the wall of
an arteriole constricts the vessel
• In a second mechanism– Precapillary sphincters control the flow of blood
between arterioles and venules
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Bui Tan Anh – College of Natural Science
• The critical exchange of substances between the blood and interstitial fluid– Takes place across the thin endothelial walls of the
capillaries
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• After chemicals are exchanged between the blood and body cells, blood returns to the heart via the veins
Blood Return Through Veins
– By the time blood exits the capillaries and enters the veins, the pressure originating from the heart has dropped to near zero
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Bui Tan Anh – College of Natural Science
– Blood still moves through the veins against the force of gravity
– As skeletal muscles contract, they help squeeze the blood along
To heart
Valve (closed) Skeletal muscle Valve (open)
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Circulation
Gas Exchange
Obtaining Nutrients
Waste Disposal
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Gas exchange
• Gas exchange
– Occurs across specialized respiratory surface
– Supplies oxygen for cellular respiration and disposes of carbon dioxide
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Organismal level
Cellular level
Circulatory system
Cellular respiration ATPEnergy-richmoleculesfrom food
Respiratorysurface
Respiratory medium(air of water)
O2 CO2
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• Animals require large, moist respiratory surfaces for the adequate diffusion of respiratory gases
– Between their cells and the respiratory medium, either air or water
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Mammalian Respiratory Systems
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• In mammals, air inhaled through the nostrils
– Passes through the pharynx into the trachea, bronchi, bronchioles, and dead-end alveoli, where gas exchange occurs
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How a Mammal Breathes
• Mammals ventilate their lungs
– By negative pressure breathing, which pulls air into the lungs
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Oxygen Transport
• The respiratory pigment of almost all vertebrates
– Is the protein hemoglobin, contained in the erythrocytes
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• Like all respiratory pigments
– Hemoglobin must reversibly bind O2, loading O2 in the lungs and unloading it in other parts of the body
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Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings
• Loading and unloading of O2
– Depend on cooperation between the subunits of the hemoglobin molecule
• The binding of O2 to one subunit induces the other subunits to bind O2 with more affinity
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Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings
Carbon Dioxide Transport
• Hemoglobin also helps transport CO2
– And assists in buffering
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Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings
• Carbon from respiring cells
– Diffuses into the blood plasma and then into erythrocytes and is ultimately released in the lungs
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Circulation
Gas Exchange
Obtaining Nutrients
Waste Disposal
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Bui Tan Anh – Department of Biology – College of Natural Science
The mammalian digestive system
• Each organ of the mammalian digestive system has specialized food-processing functions
• The mammalian digestive system consists of the alimentary canal
– And various accessory glands that secrete digestive juices through ducts
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Bui Tan Anh – Department of Biology – College of Natural Science
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Bui Tan Anh – Department of Biology – College of Natural Science
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Bui Tan Anh – Department of Biology – College of Natural Science
• Food is pushed along the digestive tract by peristalsis
– Rhythmic waves of contraction of smooth muscles in the wall of the canal
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Bui Tan Anh – Department of Biology – College of Natural Science
The Oral Cavity, Pharynx, and Esophagus
• In the oral cavity, food is lubricated and digestion begins
– And teeth chew food into smaller particles that are exposed to salivary amylase, initiating the breakdown of glucose polymers
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Bui Tan Anh – Department of Biology – College of Natural Science
• The region we call our throat is the pharynx
– A junction that opens to both the esophagus and the windpipe (trachea)
• The esophagus
– Conducts food from the pharynx down to the stomach by peristalsis
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Bui Tan Anh – Department of Biology – College of Natural Science
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Bui Tan Anh – Department of Biology – College of Natural Science
The Stomach
• The stomach stores food
– And secretes gastric juice, which converts a meal to acid chyme
• Gastric juice
– Is made up of hydrochloric acid and the enzyme pepsin
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Bui Tan Anh – Department of Biology – College of Natural Science
• The lining of the stomach
– Is coated with mucus, which prevents the gastric juice from destroying the cells
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Bui Tan Anh – Department of Biology – College of Natural Science
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Bui Tan Anh – Department of Biology – College of Natural Science
• Gastric ulcers, lesions in the lining
– Are caused mainly by the bacterium Helicobacter pylori
1 µm
Bacteria
Mucuslayer of stomach
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Bui Tan Anh – Department of Biology – College of Natural Science
The Small Intestine
• The small intestine
– Is the longest section of the alimentary canal
– Is the major organ of digestion and absorption
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Bui Tan Anh – Department of Biology – College of Natural Science
Enzymatic Action in the Small Intestine
• The first portion of the small intestine is the duodenum
– Where acid chyme from the stomach mixes with digestive juices from the pancreas, liver, gallbladder, and intestine itself
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Bui Tan Anh – Department of Biology – College of Natural Science
Enzymatic Action in the Small Intestine
Liver Bile
Acid chyme
Stomach
Pancreatic juice
Pancreas
Intestinaljuice
Duodenum of small intestine
Gall-bladder
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Bui Tan Anh – Department of Biology – College of Natural Science
• The pancreas produces proteases, protein-digesting enzymes
– That are activated once they enter the duodenum
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Bui Tan Anh – Department of Biology – College of Natural Science
PancreasMembrane-boundenteropeptidase
Trypsin
Active proteases
Lumen of duodenum
Inactivetrypsinogen
Other inactiveproteases
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Bui Tan Anh – Department of Biology – College of Natural Science
• Enzymatic digestion is completed
– As peristalsis moves the mixture of chyme and digestive juices along the small intestine
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Bui Tan Anh – Department of Biology – College of Natural Science
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Bui Tan Anh – Department of Biology – College of Natural Science
Absorption of Nutrients
• The small intestine has a huge surface area
– Due to the presence of villi and microvilli that are exposed to the intestinal lumen
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Bui Tan Anh – Department of Biology – College of Natural Science
• The enormous microvillar surface
– Is an adaptation that greatly increases the rate of nutrient absorption
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Bui Tan Anh – Department of Biology – College of Natural Science
• The core of each villus
– Contains a network of blood vessels and a small vessel of the lymphatic system called a lacteal
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Bui Tan Anh – Department of Biology – College of Natural Science
• Amino acids and sugars
– Pass through the epithelium of the small intestine and enter the bloodstream
• After glycerol and fatty acids are absorbed by epithelial cells
– They are recombined into fats within these cells
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Bui Tan Anh – Department of Biology – College of Natural Science
• These fats are then mixed with cholesterol and coated with proteins
– Forming small molecules called chylomicrons, which are transported into lacteals
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Bui Tan Anh – Department of Biology – College of Natural Science
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Bui Tan Anh – Department of Biology – College of Natural Science
The Large Intestine
• The large intestine, or colon
– Is connected to the small intestine
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Bui Tan Anh – Department of Biology – College of Natural Science
• A major function of the colon
– Is to recover water that has entered the alimentary canal
• The wastes of the digestive tract, the feces
– Become more solid as they move through the colon
– Pass through the rectum and exit via the anus
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Bui Tan Anh – Department of Biology – College of Natural Science
• The colon houses various strains of the bacterium Escherichia coli
– Some of which produce various vitamins
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Circulation
Gas Exchange
Obtaining Nutrients
Waste Disposal
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Bui Tan Anh – Department of Biology – College of Natural Science
Animal’s nitrogenous wastes
• The type and quantity of an animal’s waste products
– May have a large impact on its water balance
• Among the most important wastes
– Are the nitrogenous breakdown products of proteins and nucleic acids
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Bui Tan Anh – Department of Biology – College of Natural Science
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Bui Tan Anh – Department of Biology – College of Natural Science
The mammalian excretory system
• Nephrons and associated blood vessels are the functional unit of the mammalian kidney
• The mammalian excretory system centers on paired kidneys
– Which are also the principal site of water balance and salt regulation
• Each kidney
– Is supplied with blood by a renal artery and drained by a renal vein
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Bui Tan Anh – Department of Biology – College of Natural Science
Organs of the Urinary System
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Bui Tan Anh – Department of Biology – College of Natural Science
Anatomy of the Kidney
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Bui Tan Anh – Department of Biology – College of Natural Science
• The nephron, the functional unit of the vertebrate kidney
– Consists of a single long tubule and a ball of capillaries called the glomerulus
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Bui Tan Anh – Department of Biology – College of Natural Science
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Bui Tan Anh – Department of Biology – College of Natural Science
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Bui Tan Anh – Department of Biology – College of Natural Science
A renal corpuscle
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Bui Tan Anh – Department of Biology – College of Natural Science
Excretory Processes
• Most excretory systems
– Produce urine by refining a filtrate derived from body fluids
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Bui Tan Anh – Department of Biology – College of Natural Science
• Key functions of most excretory systems are
– Filtration, pressure-filtering of body fluids producing a filtrate
– Reabsorption, reclaiming valuable solutes from the filtrate
– Secretion, addition of toxins and other solutes from the body fluids to the filtrate
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Bui Tan Anh – Department of Biology – College of Natural Science
Three basic function of nephron
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Bui Tan Anh – Department of Biology – College of Natural Science
Glomerular Filtration
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Bui Tan Anh – Department of Biology – College of Natural Science
• Secretion and reabsorption in the proximal tubule
– Substantially alter the volume and composition of filtrate
• Reabsorption of water continues
– As the filtrate moves into the descending limb of the loop of Henle
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Bui Tan Anh – Department of Biology – College of Natural Science
• As filtrate travels through the ascending limb of the loop of Henle
– Salt diffuses out of the permeable tubule into the interstitial fluid
• The distal tubule
– Plays a key role in regulating the K+ and NaCl concentration of body fluids
• The collecting duct
– Carries the filtrate through the medulla to the renal pelvis and reabsorbs NaCl
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Bui Tan Anh – Department of Biology – College of Natural Science
Proximal tubule
Filtrate
H2OSalts (NaCl and others)HCO3
–
H+
UreaGlucose; amino acidsSome drugs
Key
Active transportPassive transport
CORTEX
OUTERMEDULLA
INNERMEDULLA
Descending limbof loop ofHenle
Thick segmentof ascendinglimb
Thin segmentof ascendinglimb
Collectingduct
NaCl
NaCl
NaCl
Distal tubule
NaCl Nutrients
Urea
H2O
NaClH2O
H2OHCO3 K+
H+ NH3
HCO3
K+ H+
H2O
1 4
32
3 5
From Blood Filtrate to Urine: A Closer Look
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