单选Which of the heart chamber receives blood returning from the pulmonary veins?( )
A. right ventricle
B. right atrium
C. left ventricle
D. left atrium
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单选Which of the following statement is not true? ( )
A. the distal end of the bundle of His is called purkinje fiibers
B. the signal from the sinoatrial node can be directly transported to Bundle of His
C. the sinoatrial node sets the rhythm for heart beat
D. the signal from the A-V node is passed to bundle of His
单选________ are smallest blood vessels, which provide sites of exchange of substances between the blood and the body cells
A. veins
B. capillaries
C. venules
D. arteries
单选Which of the following is the innermost layer of the heart wall?( )
A. epicardium
B. myocardium
C. endocardium
D. pericardium
单选Which of the following means heart muscle disease? ( )
A. tachycardia
B. pericarditis
C. cardiomyopathy
D. cardiomegaly
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