11. A precapillary sphincter will _______ in response to a localized decrease in [O2]. a. Constrict b. Relax 12. Thoroug

[answerhappygod]

11. A precapillary sphincter will _______ in response to alocalized decrease in [O2].
a. Constrict b. Relax
12. Thoroughfare channels normally prevent blood flow from everstopping in a capillary bed.
a. True b. False
13. Your body has more than enough blood to keep all of yourcapillaries filled with blood at all times.
a. True b. False
14. At any one time, most of your blood is found in your
a. Systemic venous system b. Heart c. Systemic capillaries d.Pulmonary circuit
15. Blood velocity (speed of blood flow) _________ as bloodreturns to the heart through the veins.
a. Decreases b. Increases c. Remains steady
16. When measuring blood pressure with a sphygmomanometer, whenthe physician first starts to hear blood “whooshing” through thebrachial artery, he/she will record this pressure as
a. Systolic pressure b. Diastolic pressure