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Section 35-1

Figure 35-2 Human Organ Systems Part I

Human Organ Systems

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Levels of Organization

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Chemical atoms combined to formmolecules

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

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Chemical levelAtoms 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 ofdifferent types of tissues

6 Organismal levelThe human organism ismade up of many organsystems

Atoms

MoleculesSmooth muscle cell

Smooth

muscletissue

Connectivetissue

Smoothmuscletissue

Epithelialtissue

Bloodvessel(organ)

Heart

Bloodvessels

Cardiovascularsystem

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Organization of The Body

The eleven organ systems of the human body

work together to maintain homeostasis

Homeostasis process which organisms

maintain a relatively stable internalenvironment

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Tissues

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Organs

When a bunch of different types of tissues worktogether, they form an organ.

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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.

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ORGAN SYSTEMS

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Nervous System Integumentary System Skeletal System Muscular System Circulatory System

Section 35-1

Figure 35-2 Human Organ Systems Part I

Human Organ Systems

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Nervous System Integumentary System Skeletal System Muscular System Circulatory System

Section 35-1

Figure 35-2 Human Organ Systems Part I

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Nervous System Integumentary System Skeletal System Muscular System Circulatory System

Section 35-1

Figure 35-2 Human Organ Systems Part I

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Nervous System Integumentary System Skeletal System Muscular System Circulatory System

Section 35-1

Figure 35-2 Human Organ Systems Part I

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Nervous System Integumentary System Skeletal System Muscular System Circulatory System

Section 35-1

Figure 35-2 Human Organ Systems Part I

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Nervous System

Brain, Spinal cord, periperal nerves

Function: Coordinates the bodys response to

changes in its internal and externalenvironments

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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

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Respiratory System

Nose, pharynx, larynx, trachea, bronchi,

bronchiales, lungs

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

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Digestive System

Mouth, pharynx, esophagus, stomach, small

and large intestine

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

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Excretory System

Skin, lungs, kidneys, ureters, urinary bladder,

urethra

Function: Eliminates waste products ofmetabolism from the body; maintainshomeostasis

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Skeletal System

Bones, cartilage, ligaments, tendons

Function: Supports the body; protects

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

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Muscular System

Skeletal muscle, smooth muscle, cardiac

muscle

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

digestive system

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Circulatory System

Heart, Blood vessels, blood

Function: Brings oxygen, nutrients, and

hormones to cells; fights infection; regulatesbody temperature

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Endocrine System

Hypothalamus, pituitary, thyroid,

parathyroids, adrenals, pancreas, ovaries(in

females), testes (in males) Function: Controls growth, development,

metabolism, and reproduction

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Reproductive System

Testes, epididymis, vas deferens, urethra, and

penis (in males); Ovaries, fallopian tubes,

uterus, vagina (in females). Produces reproductive cells; in females,

nurtures and protects developing embryo

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Lymphatic System

White blood cells, thymus, spleen, lymph

nodes, lymph vessels

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

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Organ Systems Interrelationships

The integumentary systemprotects the body from theexternal environment

Digestive and respiratorysystems, in contact with theexternal environment, take in

nutrients and oxygen

Nutrients and oxygen aredistributed by the blood

Metabolic wastes areeliminated by the urinary andrespiratory systems

Figure 1.2

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4th Level: Organ Systems

2nd Level: Tissues

3rd Level: Organs

5th Level: Organisms

1stLevel: Cells

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Organism

A single living organism.

Example: Humans, Cows, Birds, Trees.

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Population

A group of organisms of one type staying in

the same area.

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Community

Different populations that live together.

Examples: Cows, snakes grass, hawk.

They must all be LIVINGThings

The community below includes the horses, cows,

chickens & dogs

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Great Job!!!