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ANS 7. . Alveoli are covered with blood capillaries so that the exchange of gases can take place between the membranes of the alveoli and the surrounding capillaries. The blood capillaries covering alveoli have a low oxygen and high carbon dioxide concentrations.
ANS 8. This decreases the number of oxygen molecules per breath making the person suffocated at high altitudes. Mountaineer's carry oxygen cylinders because when they go high the the altitude decrease and the level of oxygen goes down so they carry oxygen cylinders.
ANS 9. U CAN SEE THE DIAGRAM ON INTERNET.
ANS 10. The function of the nasal cavity is to warm, moisturize, and filter air entering the body before it reaches the lungs. Hairs and mucus lining the nasal cavity help to trap dust, mold, pollen and other environmental contaminants before they can reach the inner portions of the body.
ANS 11. Insects breathe through small, paired holes called spiracles, which open into the tracheae. Tracheae and tracheoles deliver oxygen directly to air sacs and tissue cells and carry away carbon dioxide. A fish's respiratory system is a pump mechanism.
ANS 12. Aerobic respiration needs oxygen to occur, while anaerobic does not. This presence of oxygen determines what products will be created. During aerobic respiration, carbon dioxide, water, and ATP are produced. During anaerobic respiration, lactic acid, ethanol, and ATP are created.
ANS 13. Muscle cramps during exercise are very common, even in elite athletes. ... Elite athletes experience cramping due to paces at higher intensities. The cause of exercise-associated muscle cramps is hypothesized to be due to altered neuromuscular control, dehydration, or electrolyte depletion.
ANS 14. The plants get energy through the process of respiration in which glucose food breaks down in the presence of oxygen to form carbon dioxide and water with the release of energy. This energy is used by the plant for carrying out its various life processes.
ANS 15. The diaphragm is a dome-shaped muscle below the lungs that controls breathing. The diaphragm flattens out and pulls forward, drawing air into the lungs for inhalation. During exhalation the diaphragm expands to force air out of the lungs. Adults normally take 12 to 20 breaths per minute.
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