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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
• 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?
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
– 3 kinds of blood vessels:
• 1. Arteries: takes blood away from your
• 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
Digestive System
• Breaks down food you eat into
nutrients that your body can
• Includes: mouth, pharynx,
esophagus, stomach, small
intestine, large intestine, and
• Where does digestion begin???