The myocardium receives about 5% of circulating blood even though the heart is only 0.5% of total body weight. Which of the statements below is most closely related to this fact?
A. The left coronary artery supplies both ventricles and the left atrium.
B. Cardiomyocytes have large mitochondria that make up about 25% of cell volume.
C. The myocardium of the left ventricle is strikingly thick because it serves to pump blood to all tissues.
D. There are several arterial anastomoses in coronary circulation.
E. The coronary arteries carry more blood during ventricular diastole than they do during ventricular systole.
Answer: B
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A) heart rate. B) thickness of the myocardium. C) size of the ventricle. D) venous return. E) end-systolic volume.
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Compared to capillary beds in the rest of the body, the hydrostatic pressure within the glomerular capillary bed is:
a) lower b) higher
Normal RBC count per cubic millimeter (mm3) of blood is:
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