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RESPIRATORY SYSTEM. 7 th Grade Science. FUNCTION. To get oxygen from the environment and remove carbon dioxide and other waste products from your body. AIR. Air is not made up only of oxygen, but of many other gases as well . CELLULAR RESPIRATION.
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RESPIRATORY SYSTEM 7th Grade Science
FUNCTION To get oxygen from the environment and remove carbon dioxide and other waste products from your body.
AIR Air is not made up only of oxygen, but of many other gases as well
CELLULAR RESPIRATION Occurring inside your cells, this process uses oxygen in chemical reactions that release energy. It uses glucose and oxygen and releases carbon dioxide.
STRUCTURES • Mouth/Nose • Epiglottis • Trachea • Lungs • Bronchial Tubes • Bronchioles • Alveoli • Diaphragm
1. Oxygen is supplied to the body (inhale) 2. Oxygen is carried to the body cells (cellular respiration) BREATHING
BREATHING 3. Carbon dioxide is removed from cells to lungs (circulation) 4. Carbon dioxide waste is expelled (exhale)
Path for air Trachea Bronchi Smaller tubes Bronchioles Alveoli
SPEAKING • Air from lungs is forced between vocal cords • Vocal cords vibrate • Sound waves are generated • Sound waves are shaped to form specific sounds • The sound waves travel through the air and are interpreted as speech
DISEASES Bronchitis: bronchioles swell and too much mucus Emphysema: alveoli enlarge Cancer: uncontrolled cell growth Asthma
FUN FACTS • You breathe about 21,600 times per day. • If you spread out your lungs, they would cover the floor of a racquetball court (about 88 square yards)
FUN FACTS You might get the hiccups if your diaphragm involuntarily tightens, sending air rushing into your lungs while your vocal chords shut. A sneeze shoot air out of your nose at about 100 miles per hour.
Hold it! Directions: Complete each experiment and record your findings in a chart like the one below.
Experiment 1: Hold your breath for as long as you can. Have your partner time you.
Experiment 2: Breath normally. Have your partner time you for 30 seconds. Count your respirations (breaths).
Experiment 3: Try to slow your breathing down. Count how few respirations you can take in 30 seconds
Experiment 4: Run as fast as you can in place for 30 seconds. As soon as you stop running, count your respirations for 30 seconds.
Experiment 5: Lie down for two minutes and try to relax. After two minutes count your respirations for 30 seconds.