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
You might also like to view...
Compared to capillary beds in the rest of the body, the hydrostatic pressure within the glomerular capillary bed is:
a) lower b) higher
According to Starling's law of the heart, the cardiac output is directly related to the
A) heart rate. B) thickness of the myocardium. C) size of the ventricle. D) venous return. E) end-systolic volume.
The release of GnRH inhibits the secretion of FSH
Indicate whether the statement is true or false
Normal RBC count per cubic millimeter (mm3) of blood is:
A) 4.8 million for males, 3.5 million for females B) 4.8 million for males, 5.4 million for females C) 5.4 million for males, 4.8 million for females D) 5.4 million for males, 2.0 million for females