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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 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/pg 000008.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???