Organ Systems

Some interesting body facts….• Heat released by the human body in one hour can boil 5

liters of water in one hour. • Our eyes blink in order to clean tears and moisture from

the eye balls so that we can see clearly. • Blinking also is a reflex action that protects the eyes. If

something is thrown at your eyes you will immediately blink.

• We die of hunger after 9 days because our stomach digests itself.

• The strongest and the sturdiest muscle of the human body is the tongue.

• At the time of birth, babies don't have knee caps. Knee caps grow gradually and they are there by the age 2.

What does your body do?

•http://yucky.discovery.com/noflash/body/pg000008.html

Major Organ Systems

Integumentary System

• Covers your body and protects the tissue underneath

• Includes: skin, hair, and nails

Muscular System• Works with the skeletal system to

help you move

– 1. Skeletal muscle: helps bones move

– 2. Smooth muscle: moves food

– 3. Cardiac muscle: pumps blood

Skeletal System

• Provides a frame to support and protect your body parts

• Includes: bones, cartilage, and connective tissue

Cardiovascular/ Circulatory System

• Pumps blood through all of your blood vessels

• Includes: heart, blood, and blood vessels– 3 kinds of blood vessels:

• 1. Arteries: takes blood away from your heart

• 2. Veins: takes blood to the heart• 3. Capillaries: allows things to leave your

blood and get to body cells

Respiratory System

• Takes in oxygen and releases carbon dioxide

• Includes: nose, throat, and lungs

Nervous System

• Receives and sends electrical messages throughout your body

• Includes: brain, spinal cord, and nerves

Digestive System• Breaks down food you eat into

nutrients that your body can absorb

• Includes: mouth, pharynx, esophagus, stomach, small intestine, large intestine, and liver

• Where does digestion begin???