The Lungs and Gas Exchange Enter T or F (true or false) in the answer blanks. Th

Question

The Lungs and Gas Exchange Enter T or F (true or false) in the answer blanks. The gas-exchange region in the lungs must be: dry, thin and large. During inhalation, negative pressure draws air into the lungs. During exhalation, the diaphragm rises. Because of diffusion, oxygen naturally moves out of the blood and into the lungs. Each red blood cell contains from 10-100 molecules of hemoglobin. Answer the following question. Explain why incomplete ventilation is important for effective gas exchange.

Explanation / Answer

1) False.

The gas exchange region must be moist, thin and small.

The moist region helps the movement of the air, thin region make easy the exchange of gases and small size will increase the surface area to. Increase the gas exchange.

2) True

During inhalation, the volume of the thoracic cavity increases, causing intrapulmonary pressure to fall below atmospheric pressure. This is known as a negative pressure. Since air moves from areas of high to low air pressure, air flows into the lungs.

3) False

During exhalation diaphragm relaxes and because of it the tissue which it has depressed to RISE superiorly during inhalation RISES and put pressure on lungs to expel the air.

4) False

Oxygen diffuses from the alveoli to the blood naturally.

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