Download Antlers and Horns (Let's Look at Animals Discovery Library) by Jason Cooper PDF

By Jason Cooper

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9 gallons at rest to 40 gallons after strenuous activity. • See page 32 for the heart rate during exercise. 50 ft. HOW AIR CHANGES 25 ft. other • The right lung has three lobes and is on average about onefifth bigger than the left lung. oxygen other oxygen 0 ft. 03% carbon dioxide 4% carbon dioxide BRANCHING AIRWAYS Air passes through a series of chambers and tubes on its way to deep in the lungs. BREATHING AND The total length of all the air tubes in the lungs joined end to end is about 31 miles.

WINDPIPE (TRACHEA) • See page 54 for information on the tonsils. 3 in. 8 in. wide, kept open by 16–20 C-shaped pieces of ringed cartilage. Hairs in the nostrils filter out dust and germs, the slimy mucus lining in the nasal chamber traps dirt and germs, and this blood-rich lining also warms and dampens incoming air. THROAT A passageway for both food and air. TERMINAL BRONCHIOLES BRONCHIOLES Smaller airways branching from the main bronchi. Air passing out of the lungs has a useful extra effect—speech.

One-ninth is dead microbes that live naturally in the large intestine and help with digestion. One-ninth or more of the rest is undigested food, especially fiber. In the esophagus, peristalsis is so strong it works even if the body is upside down. ). The last part of the passageway, a ring of muscle that relaxes to let out the solid waste. • See page 29 for information on saliva. • Without food inside, most of the digestive passageway is squeezed flat by the natural pressure inside the body. 3 in.

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