PRACTICE QUESTIONS
1. According to Table 18-2» how long does it take for blood to travel the length of a canine capillary?
a. 0.05 second
b. 0.1 second
c. 1 second
d. 10 seconds
e. 20 seconds
2.
The amount of blood pumped by the left ventricle in1 minute would equal:
a. The amount of blood that flowed through the coronary circulation (in the same minute)
b. One half of the cardiac output
c. Two times the cardiac output
d. The amount of blood that flowed through all organs of the systemic circulation» except for coronary blood flow
e. The amount of blood that flowed through the lungs
3. A transfusion of normal plasma into a normal dog would:
a. Decrease the hematocrit of the recipients blood.
b. Increase the viscosity of the recipient’s blood.
c. Decrease the mean corpuscular hemoglobin concentration (MCHC) in the recipient’s plasma.
d. Increase the number of cells in the recipient’s blood.
e. Decrease the concentration of proteins in the recipient’s plasma.
4. Which of the following sequences of capillary beds might a red blood cell encounter in a normal circulation?
a. Lungs, skin, lungs, brain
b. Spleen, liver, mesentery, lungs
c. Coronary, kidney (glomerular), kidney (tubular), lungs
d. Lungs, coronary, stomach, liver
e. Brain, lungs, liver, coronary
5. The walls of most capillaries have pores or clefts in them, which are approximately 4 nm in diameter (4 ? 10^9 m). According to Figure 18-7:
a. A capillary pore is many times larger in diameter than a sodium ion.
b. An albumin molecule is approximately 2.5 times longer than the diameter of a capillary pore.
c. The diameter of a red blood cell is many times greater than the diameter of a capillary pore.
d. A molecule of β globulin or γ globulin could just about squeeze through a capillary pore if it were lined up exactly right.
e. All the above are correct.
6. Suppose that the following conditions exist in a particular blood vessel: blood pressure (BP) inside vessel at inlet = 60 mm Hg, BP inside vessel at midpoint = 45 mm Hg, BP inside vessel at outlet = 30 mm Hg, BP outside vessel at midpoint = 5 mm Hg. Under these conditions:
a. Perfusion pressure for blood flow through this vessel = 30 mm Hg.
b. Perfusion pressure for blood flow through this vessel = 15 mm Hg.
c. Distending pressure at the vessel midpoint = 45 mm Hg.
d. Distending pressure at the vessel midpoint = 40 mm Hg.
e. Both a and d are correct.
7. Compared with the systemic circulation, the pulmonary circulation:
a. Carries more blood flow per minute.
b. Has a lower perfusion pressure.
c. Has a higher resistance to blood flow.
d. Carries blood that has a lower hematocrit.
e. Contains a higher blood volume.