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Our Human Body

-Your human body systems work together to function for the whole (organism).

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A system is a whole made up of many parts.

Organization in the human body:

1) Cell

2) Tissue

3) Organ

4) System

5) Organism

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I. Nervous System

• Functions to direct (control) your body’s actions via electrical impulse.

• Receives & responds to information.

• Stores & processes information.

• Maintains homeostasis.

Organs: Brain, Spinal Cord

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II. Endocrine System

• Functions to control and regulate your body’s actions by secreting chemicals (hormones).

Organs: See image to right-->

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III. Digestive System• Functions to break

down the food you eat to a small enough size for cell entry.

• Breakdown is mechanical & chemical.

• Also functions to eliminate waste.

Organs: Mouth, esophagus, intestines, stomach … See figure to right

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IV. Immune System

• Functions to combat infection and fight off disease.

Organs: See image to right-->

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V. Circulatory System• Also known as the

cardiovascular system.

• Functions to transport materials to & from all cells of your body.

Organs: Heart, arteries, veins, aorta.

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VI. Respiratory System

• Functions to bring oxygen in to your body and remove carbon dioxide waste.

Organs: Lungs, trachea, mouth, bronchi

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VII. Skin System • Functions to cover and

protect your body.• Regulates body

temperature.• Senses environment.• Removes waste.• Produces vitamin D.• aka: Integumentary

system

Organs: skin, hair, sweat glands,nails.

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VIII. Skeletal System

• Functions to shape & support your body.

• Protects organs.• Produces blood cells.• Stores minerals (Ca2+) &

other needed materials.

Organs: skull, femur, rib cage, sternum and all other bones.

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IX. Muscular System

• Functions to provide movement.

Organs: biceps, triceps, deltoids…

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X. Reproductive System• Functions to

allow humans to mix their genetics through sexual reproduction, thus making unique offspring

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XI. Excretory System

• Functions to filter and eliminate liquid waste.

• Also removes excess water.

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are needed to see this picture.

Organs: see image to right -->

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How does your stomach work with other systems?

• Smooth muscles contract to move food along your digestive tract. [peristalsis]

• Blood vessels deliver oxygen to stomach cells. (circulatory)

• Strong acids kill off harmful pathogens, thus improving immunity.

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How does your liver work with multiple systems?

• Makes bile for digestion of fats.

• Breaks down medicines to support immunity.

• Filters blood from circulation.

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How do your bones work with other systems?

• Bone marrow produces blood cells (circulatory).

• Bones attach to skeletal muscle for movement.

• Bones protect vital organs, i.e. brain (Nervous).