true are false 7.The percentage of carbon dioxide is higher in inhaled air in comparison to exhaled air.
8. We often feel hungry after a physical exercise.
9. Increased physical activity reduces the rate of breathing.
10. Elephants, snakes and birds have lungs for breathing.
Answers
Answer:
7. Inhaled air is by volume 79% nitrogen, 20.95% oxygen and small amounts of other gases including argon, carbon dioxide, neon, helium, and hydrogen. The gas exhaled is 4% to 5% by volume of carbon dioxide, about a 100 fold increase over the inhaled amount.
8. “Post training, many people get hungry due to our sympathetic nervous system. We cool down and then need to metabolize food in order to refuel for energy,” he says. “This is because during intense exercise, our metabolisms spike significantly compared to rest and stay like that even after we cool down.”
9. However, regular exercise can increase the strength and function of your muscles, making them more efficient. Your muscles will require less oxygen to move and they will produce less carbon dioxide. This will immediately reduce the amount of air you will need to breathe in and out for a given exercise.
10. Breathing in other Animals
Animals such as elephants, lions, cows, goats, frogs, lizards, snakes, birds, have lungs in their chest cavities like the human beings. Cockroach: A cockroach has small openings on the sides of its body. Other insects also have similar openings. These openings are called spiracles.
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