excretory system - ummg.gov.mm · excretory system presented by daw ei ei khing assistant lecturer...
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EXCRETORY SYSTEM
Presented by
Daw Ei Ei khing
Assistant Lecturer
Zoology Department
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Objective
1. Define the term excretion and describe how this process helps maintain homeostasis
2. Name the major metabolic wastes and the processes by which they are formed
3. Describe type of vertebrate kidney.
4. Explain the parts of urinary system and the process of urine formation.
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As an organism carries out its life processes
- waste products built up in the body fluids
Life processes
• Respiration
• Feeding
• Sensitivity
• Movement
• Reproduction
• Growth
• Excretion
Waste product (metabolic waste)
the products of metabolic activity
- after oxygen and nutrients have
been supplied to a cell
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- If these metabolic wastes were not from the body,
removed
the organism would die.
- Therefore, organism must be able metabolic waste
to remove &
other excess
substances
(e.g- salt, water)
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Excretion
- The process by which these metabolic waste &
excess substances are removed from the
organism.
- also removes excess heat from the body,
keep the temperature of the body constant.
(Thermoregulation) ( e.g - sweating )
The average human body temperature
37°C , 98.2°F
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Thermoregulation • Sweat glands in the skin secrete
sweat onto the surface of the skin
• To evaporate
• Sweat draws heat from the skin and dilated capillaries
• Various metabolic wastes are also excreted by sweat
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Organs of excretion In humans & other complex animals,
Organs of excretion are – lungs, kidneys, liver & skin
Skin
excretes water and other salts in the sweat
Liver
excrete bile pigments
and cholestrol
Lungs excrete carbon dioxide
and water
Kidneys
excrete urea
and water
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These organs work with circulatory , nervous &
endocrine systems
to keep or maintain
the body’s internal environment constant
(homeostasis)
Homeostasis – the process involved in maintaining the internal condition of an organism so that normal metabolic activity continues even though the external environment condition vary , Temperature regulation (thermoregulation) and osmoregulation are examples of homeostatic control.
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Osmoregulation
Water content of the blood LOW
Brain produces More ADH
Too much salt or sweating
High volume of water reabsorbed by kidney
Urine output LOW
(small volume of Concentrated urine)
Water content of the blood normal
Too much water drunk
Water content of the blood HIGH
Brain produces Less ADH
Low volume of water reabsorbed by kidney
Urine output HIGH
(large volume of dilute urine)
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Major Metabolic Wastes Most important metabolic wastes are
- Carbondioxide formed during cellular
respiration
- Water glucose + oxygen water +
carbondioxide + energy
- Certain nitrogen compounds formed by
( ammonia, urea & uric acid ) break down of
amino acid
- Mineral salts build up during
( sodium chloride & metabolism
potassium sulfate)
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Major Metabolic Wastes
Excretory organs Metabolic wastes
1.Lungs Carbondioxide,Water (Cellular respiration)
2. Skin Water, Salts (Perspiration)
3. Liver Nitrogen Compounds (Ammonia,Urea,Uric acid)
4.Kidney Mineral salts(Sodium chloride and Potassium sulfate) and water (Urination)
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Formation of urea
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- All of these wastes poisonous
in high concentration
Elimination or Defecation
- The removal from the digestive tract of
unabsorbed and undigested food, in the form of
feces.
- These materials have never entered the body
cells,
- are not metabolic wastes(non-metabolic wastes)
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Liver Function (Detoxification & Inactivation)
- Liver - removes harmful substances
( bacteria, certain drugs & hormones )
from the blood.
- changed harmful substances into inactive
or less poisonous forms
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- Thus, liver purifies the blood.
detoxifies
- Inactive substances returned blood stream
formed in the liver to
excreted from the body
by kidneys
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Formation of urea
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Formation of urea
- Amino acids are the break down
products of proteins.
- Excess amino acids cannot be in the body
stored
are in the liver
broken down
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- Parts of are into other substances
amino acids changed
- Amino acids by deamination amino group (NH2)
is changed into
Ammonia (NH3)
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- The remainder of the amino acid molecule
is changed into ;
- pyruvic acid (used as an energy source in
cellular respiration)
- glycogen or fat ( storage )
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Amino acids Structure
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- The ammonia produced is very poisonous
from amino group
- In liver,
ammonia + carbondioxide enzyme-catalyzed urea
reaction
- ammonia is changed urea
into (less harmful substance)
by a series of enzyme-catalyzed reactions
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- Urea from liver diffuse into blood stream.
- Bloodstream carries urea to kidneys.
- Kidneys filter urea from blood
- Urea is finally from the body
excreted in the urine
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The urinary system
- Kidneys
- Ureters
- Urinary bladder
- Urethra
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The urinary system
- Kidneys ( organs that produce urine )
- Ureters ( tubes, urine passes from kidneys
through which to the urinary bladder)
- Urinary bladder ( sac which stored urine )
- Urethra ( the stored urine travels from the
bladder to the outside of the body through which
during urination )
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Urine Formation
- Urine is made
- in the nephrons
Glomerulus Bowman’s capsule
Proximal tubule
Loop of Henle
Distal tubule
Collecting duct
Peritubular capillaries
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1 2 3
Duct
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- in two stages
( filtration & reabsorption)
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- During the first stage ( Filtration stage )
- useful substances ( glucose, salt, vitamin )
- wastes ( urea )
are removed from the blood.
Glomerulus
Bowman’s capsule
(Filtrate useful substances & wastes from the blood)
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- During the second stage ( reabsorption stage )
- some of the useful substances
re-enter the blood
to be used by the body. Proximal tubule
Distal tubule
Collecting
duct Loop of Henle
Peritubular capillaries
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Filtration
- Filtration take in the glomeruli &
place Bowman’s capsules
- The blood is under pressure
(enters a glomerulus)
Bowman’s capsule
Glomerulus
Blood Under pressure
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- The pressure forces the filtrate
(water, urea, glucose,
amino acids & various salts )
through thin walls of glomerulus
into Bowman’s capsule.
- Blood cells & are too large to pass through
blood proteins the walls of the glomerulus.
remain in the blood
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- The filtrate is like blood plasma
(enters Bowman’s capsule) (does not contain
protein)
- If all of the filtrate that is formed were excreted,
the body would lose - too much water
- important nutrients &
- salts dissolved in the water.
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Reabsorption
- After the filtrate has left Bowman’s capsule,
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- Reabsorption occurs in the renal tubule
( uriniferous tubule )
reduces the volume of filtrate
returns various important
substances
(nutrients, water, salt)
to the blood.
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- As the filtrate passes through the renal tubules of
the nephrons,
- about 99% of water, are into the blood
glucose, amino acid reabsorbed by the
& many salt capillaries that
surround the
tubules
(peritubular capillaries)
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In mammals,
- Reabsorption of water is an important means
from the renal tubule of water
conservation
- Since most of the water is reabsorbed,
the substances left in the filtrate are highly
concentrated.
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- Water is reabsorbed by osmosis.
Osmosis - Water molecules pass from weak
solution to strong solution through
semipermeable membrane.
- Glucose, amino acid & salts are by active
absorbed transport.
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- ATP (the energy source is by many
for active transport) supplied mitochondria
found in the
cells of the
renal tubule.
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- The tubules are lined with microvilli
greatly the absorptive surface
increase area
- Large area allows the reabsorption of huge
amounts of water and
other substances.
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• Reabsorption by region: PCT
–65% sodium ions and water
–100% glucose, lactate, amino acids, vitamin
–90% bicarbonate ions
–50% chloride ions
–55% potassium ions
– calcium, phosphate, and magnesium ion (hormonally controlled)
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Loop of Henle
25% sodium ions
10% water
35% chloride
30% potassium
DCT (NOTE: not all that remains in DCT will be reabsorbed - review ADH, Aldosterone, and ANP)
10% sodium ions
10% chloride ions
25 % water
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After reabsorption
- The fluid remaining is urine
in the tubules
- Urine is made water, urea & various salts
up of
- Urine flows into the collecting ducts
(from the tubules)
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- Urine passes out to the bladder
(from the kidneys) through ureters
- Urine is to the outside
(from bladder) emptied through the urethra
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Types of Vertebrate Kidney
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Types of vertebrate kidney
- A basic structural pattern of
vertebrate kidneys (nephroi)
consists of –
(1) glomeruli, incorporated
in renal corpuscles
(malpighian)
(2) tubules, surrounded
by peritubular capillaries
(uriniferous tubules)
(3) a pair of longitudinal ducts
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from fish to man
Variation of structure of kidney:
- number & arrangement of glomeruli
- relative length of tubules
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In present-day vertebrates,
The uriniferous tubules – develop anterio-posteriorly
in two or three stages
in succession
These stages are
- pronephros (anterior kidney)
- mesonephros (mid kidney) &
- metanephros (hind kidney)
have evolved from archinephros(primitive kidney)
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Types of vertebrate kidney
Types of kidney
1.Archinephros Embryo of cyclostomes
2. Pronephros Adult cyclostomes( lamprey , hagfish ) Embryo of anamniotes ( frog, fish)
3. Mesonephros Adult Frog , Fish Embryo of amniotes
4.Metanephros Reptiles , Aves , Mammmals ( Amniotes )
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Pronephros
Pronephros
Pronephric duct
Segmental nephron
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PRONEPHROS (ANTERIOR KIDNEY)
- develop in anterior most part of
the nephrotome)
- each pronephros consists of
only 1-13 uriniferous tubules
- one pair of uriniferous tubules
in each segment
•
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Near each tubule is
- a glomerulus but Bowman’s capsule &
peritoneal funnel are lacking
- are called external glomeruli
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The uriniferous tubules of pronepros
open into
pronephric duct
runs to enter
backward
the embryonic cloaca
•
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A pair pronephroi become
functional in
- some cyclostomes
- embryos of all anamniote ( animals that have no
amnion in embryo life )
degenerate during development in
- other vertebrates
•
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MESONEPHROS ( MIDKIDNEY)
- develop from part of nephrotome
lies behind the pronephros
At first,
- consists of paired
segmental uriniferous tubules
•
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Mesonephros
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Each uriniferous tubules with
- a peritoneal funnel opening
- a glomerulus enclosed in a Bowman’s capsule
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Mesonephric uriniferous tubules
join
existing pronephric duct
called
mesonephric duct
( Wolffian duct )
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Later,
undergo
mesonephric tubules hundreds of tubules
budding
So that their segmental arrangement is lost.
Later tubules have no peritoneal funnels.
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Mesonephroi form
- adult functional kidneys in some fishes &
amphibians.
- kidneys of embryos of amniotes ( animals that
have amnion in embryo life ), but degenerate in
adult.
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Metanephros
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Metanephros
• The first embryonic hint of a metanephros is the formation the metanephric duct that appear as a ureteric diverticulum arising at the base of the preexisting mesonephric duct.
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The ureteric diverticulum grows dorsally into the posterior region of the nephric ridge.
-Here it enlarges and stimulates the growth of metanephric tubules that come to make up the metanephric kidney .
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The metanephros - becomes the adult kidney of amniotes and
the metanephric duct is called the ureter.
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