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Organ Systems

Teamwork

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Nervous

Digestive

Integumentary

Respiratory

Skeletal

Muscular

Excretory

Circulatory

Endocrine

Reproductive

Lymphatic

11 Systems in the Human Body…

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Nervous System

Structures: Brain, spinal cord, and peripheral nerves

Function: Coordinates the body’s response to changes in its internal and external environments

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Digestive System

Structures: Mouth, pharynx, esophagus, stomach, small intestines and large intestines

Function: Converts foods into simpler molecules that can be used by the cells of the body; absorbs food

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The digestive system does not work without the help of other organ systems.

The digestive system needs the cardiovascular system to deliver the nutrients to other organs in the body such as the muscles and the brain.

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Circulatory System

Structure: Heart, blood vessels, and blood

Function: Brings oxygen, nutrients, and hormones to cells; fights infections; and regulates body temperature

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Respiratory System

Structures: Nose, pharynx, larynx, trachea, bronchi, bronchioles, and lungs

Function: Provides oxygen needed for cellular respiration and removes excess carbon dioxide from the body

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The circulatory system depends on the pulmonary system (lungs) to deliver oxygen to muscles and other organs.

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Skeletal System

Structures: Bones, cartilage, ligaments, and tendons

Function: Supports the body; protects internal organs; allows movement; stores mineral reserves; and provides a site for blood cell formation

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Muscular System

Structures: Skeletal muscle, smooth muscle, and cardiac muscle

Function: Works with skeletal system to produce voluntary movement; helps to circulate blood and move food through the digestive system

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Muscles and bones work together to produce movement.

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Excretory System

Structures: Skin, lungs, kidneys, ureters, urinary bladder, and urethra

Function: Eliminates waste products of metabolism from the body and maintains homeostasis

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Integumentary System

Structure: Skin, sweat and oil glands, hair, and nails

Function: Serves as a barrier against infection and injury; helps to regulate body temperature; and provides protection against ultraviolet radiation from the sun

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Lymphatic System

Structures: White blood cells, thymus, spleen, lymph nodes, and lymph vessels

Function: Help protect the body from disease; collects fluid lost from blood vessels and returns the fluid to the circulatory system

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Getting rid of waste is another necessary function of the body:

•Lungs get rid of carbon dioxide.

•Lymphatic vessels recycle extra fluids that build-up next to cells and tissues.

• Kidneys filter the blood of toxins.

• Skin releases excess salts through sweat.

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Endocrine System

Structures: Hypothalamus, pituitary gland, thyroid, parathyroid, adrenals, pancreas, ovaries (female), and testes (male)

Function: Controls growth, development, metabolism and reproduction

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Reproductive System

Structures: Testes, epididymis, vas deferens, urethra, and penis (males); ovaries, Fallopian tubes, uterus, and vagina (females)

Function: Produces reproductive cells, in females, nurtures and protects developing embryo

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•Reproduction, growth and development are critical functions of all living things.

•The endocrine system provides the chemical messages for growth, development, and proper functioning of the reproductive system.

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Pancreas Pancreas releases releases insulin insulin

Blood sugar Blood sugar is too lowis too low

Sugar level goes to…Sugar level goes to…

HomeostasisHomeostasis

Pancreas Pancreas releases releases

glucogen glucogen

Sugar level goes to…Sugar level goes to… HomeostasisHomeostasis

Blood sugar Blood sugar is too highis too high

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