Which of the following makes breathing more difficult?
a. increased pulmonary compliance.
b. increased airway resistance.
c. decreased elastic recoil.
d. both (a) and (b) above.
e. both (b) and (c) above.
E
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The structure of a lymphatic vessel is most similar to that of a(n)
A. artery. B. vein. C. arteriole. D. capillary.
Blood moves forward through veins because of all of the following except
A) the pressure in the veins is lower than in the arteries. B) pumping by the smooth muscle in the wall of the vein. C) the respiratory pump. D) valves in the veins preventing the backward flow of blood. E) muscular compression.
Air flow in the respiratory system is driven by _____ gradients.
Fill in the blank(s) with the appropriate word(s).
Why is heparin used in a capillary tube when performing a hematocrit?
A) Heparin prevents the cells from coagulating. B) Heparin keeps the blood homogenized. C) Heparin draws the blood into the capillary tube. D) Heparin helps the cells separate by weight.