Topics: Circulation and Excretion Quiz
Why do capillary beds have such low pressure?
A. The don’t, they have very high blood pressure to force the diffusion of oxygen and nutrients into cells.
B. Fluid loss from arteries is high enought that pressure drops by the time blood reaches capillaries.
C. The total cross-section diameter of the arterial circulation increases with progression from the artery to arteriole to capillary,leading to reduced blood pressure.
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What happens when carbon dioxide levels increase in the blood?
A. pH increases forcing the organisms to decrease respiration rate
B. pH decreases forcing the organism to increase respiration rate
C. the stretch receptors in the lungs cause the medulla oblongata to slow breathing