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Section 35-1

Figure 35-2 Human Organ Systems Part I

Human Organ Systems



Human Organ Systems



Levels of Organization



Chemical

– atoms combined to form

molecules

Cellular – cells are made of molecules

Tissue – consists of similar types ofcells

Organ – made up of different types oftissues

Organ system –

consists of differentorgans that work closely together

Organismal – made up of the organsystems



Chemical level Atoms combine toform molecules

1

2

3

4

Cellular levelCells are made up of molecules

Tissue levelTissues consist ofsimilar types ofcells

5 Organ system levelOrgan systems consist of different

organs that work together closely

Organ levelOrgans are made up of

different types of tissues

6 Organismal levelThe human organism ismade up of many organsystems

Atoms

Molecules

Smooth muscle cell

Smoothmuscle

tissue

Connectivetissue

Smoothmuscletissue

Epithelialtissue

Bloodvessel(organ )

Heart

Bloodvessels

Cardiovascularsystem



Organization of The Body

The eleven organ systems of the humanbody work together to maintain

homeostasis Homeostasis – process which organisms

maintain a relatively stable internal

environment



Tissues



Organs When a bunch of different types of tissues work

together, they form an organ.



Organ Systems

Each organ in our body is part of an organsystem, a group of organs that worktogether to perform a major function.

Heart is part of your circulatory system,which carries oxygen and other materialsthroughout your body.

Besides the heart, blood vessels are organs thatwork in your circulatory system.



ORGAN SYSTEMS



Nervous System Integumentary System Skeletal System Muscular System Circulatory System

Section 35-1


Human Organ Systems




Section 35-1




Nervous System

Brain, Spinal cord, periperal nerves

Function: Coordinates the body’s response to

changes in its internal and externalenvironments



Integumentary System

Skin, hair, nails sweat and oil glands

Function: Serves as a barrier against infection

and injury; helps to regulate bodytemperature; provides protection againstultraviolet radiation from the sun



Respiratory System

Nose, pharynx, larynx, trachea, bronchi,bronchiales, lungs

Function: Provides oxygen needed for cellularrespiration and remove excess carbon dioxidefrom the body



Digestive System

Mouth, pharynx, esophagus, stomach, smalland large intestine

Function: Converts foods into simplermolecules that can be used by the cells of thebody; absorbs food



Excretory System

Skin, lungs, kidneys, ureters, urinary bladder,urethra

Function: Eliminates waste products ofmetabolism from the body; maintainshomeostasis



Skeletal System

Bones, cartilage, ligaments, tendons

Function: Supports the body; protects

internal organs; allows movement; storesmineral reserves; provides a site for blood cellformation



Muscular System

Skeletal muscle, smooth muscle, cardiacmuscle

Function: Works with skeletal system toproduce voluntary movement; helps tocirculate blood and move food through thedigestive system



Circulatory System

Heart, Blood vessels, blood

Function: Brings oxygen, nutrients, and

hormones to cells; fights infection; regulatesbody temperature



Endocrine System

Hypothalamus, pituitary, thyroid,parathyroids, adrenals, pancreas, ovaries(infemales), testes (in males)

Function: Controls growth, development,metabolism, and reproduction



Reproductive System

Testes, epididymis, vas deferens, urethra, andpenis (in males); Ovaries, fallopian tubes,uterus, vagina (in females).

Produces reproductive cells; in females,nurtures and protects developing embryo



Lymphatic System

White blood cells, thymus, spleen, lymphnodes, lymph vessels

Helps protect the body from disease; collectsfluid lost from blood vessels and returns thefluid to the circulatory system.



Organ Systems Interrelationships

The integumentary system

protects the body from theexternal environment

Digestive and respiratorysystems, in contact with the

external environment, take innutrients and oxygen

Nutrients and oxygen aredistributed by the blood

Metabolic wastes areeliminated by the urinary andrespiratory systems

Figure 1.2



• 4th Level: Organ Systems

• 2nd Level: Tissues

• 3rd Level: Organs

• 5th Level: Organisms

1st Level: Cells



Organism

A single living organism. Example: Humans, Cows, Birds, Trees.



Population

A group of organisms of one type staying inthe same area.



Community

Different populations that live together.

Examples: Cows, snakes grass, hawk. They must all be LIVING Things

The community below includes the horses, cows,chickens & dogs



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