External respiration/gas exchange is O the movement of air through bronchioles. O the movement of blood. O the exchange of gas at the alveoli. O the exchange of gas at the tissues.

At FRC the alveolar pressure is OA. Equal to plural pressure B. More negative that plural pressure C. Less than atmospheric pressure OD. Greater than atmospheric pressure OE. Equal to atmospheric pressure

When someone is standing, gravity stretches the bottom of the lung down toward the floor to a greater extent than the top of the lung. What implication could this have on the flow of air in the lungs? Where does gas exchange occur in the lungs?

Explain the two general features that breathing organs share, which optimize gas exchange.

When the lungs are in the rest phase of the breathing cycle, (Select all that apply.) O the alveolar pressure decreases in preparation for the next phase of the breathing cycle O a pressure gradient does not exispetween the alveolar and atmospheric pressures O the diaphragm is contracted O the alveolar pressure is equal to the atmospheric pressure O the diaphragm is relaxed

For inspiration to occur, which of the following has to happen first? O thoracic cavity volume increases O air (gases) flows into lungs O diaphragm ascends and rib cage lowers intrapulmonary pressure increases

If an alveolus is poorly ventilated, what is the local compensatory response? Select all that apply. O Constrict bronchioles leading to the alveolus O Dilate bronchioles leading to the alveolus Constrict blood vessels leading to the alveolus O Dilate blood vessels leading to the alveolus

When ventilation is not sufficient, which of thefollowing occurs?a. The capillary constricts.b. The capillary dilates.c. The partial pressure of oxygen in the affectedalveolus increases.d. The bronchioles dilate.

Does carbon dioxide move from the blood to the alveoli or from the alveoli to the blood and Why does it move in this direction (use it's partial pressures)?

The area in the lungs that PO2 and PCO2 do not change is called...? O Pleura O Alveoli O Dead Space O Bronchial tree