Question

ID: A 3. Which of the following could potentially cause vasoconstriction (constriction of blood vessels)? a. lying down after standing b. sweating when exercising o stress d. increased blood pressure e. allergic reactions 6. Organisms in which a circulating body fluid is distinct from the fluid that directly surrounds the body's cells are likely to have which of the following? a. an open circulatory system b. a closed circulatory system c. a gastrovascular cavity d. branched tracheae e. hemolymph 7. When you hold your breath, which of the following blood gas changes first leads to the urge to breathe? a. rising 02 b. falling 02 c. rising CO2 d. falling CO2 e. rising CO, and falling 02 8. Why is the velocity of blood flow the lowest in capillaries? a. The capillary walls are not thin enough to allow oxygen to exchange with the cells. b. Capillaries are far from the heart, and blood flow slows as distance from the heart increases. c. The diastolic blood pressure is too low to deliver blood to the capillaries at a high flow rate. d. The systemic capillaries are supplied by the left ventricle, which has a lower cardiac output than the right ventricle. e. The total surface area of the capillaries is larger than the total surface area of the arterioles. 9. Which of the following features do all gas exchange systems have in common? a. The exchange surfaces are moist. b. They are enclosed within ribs. c. They are maintained at a constant temperature. d. They are exposed to air. e. They are found only in animals.

Answer 1

5) stress

6) a closed circulatory system

7) raising Co2

8) Total surface area of the capillaries is larger than total surface area of the arterioles

9) The exchange surfaces are moist