The __________ is the sac around the heart. A: endocardium B: myocardium C: pericardium D: incaidium

The __________ is the sac around the heart. A: endocardium B: myocardium C: pericardium D: intracardium

Which one of the following situations is not associated with the dysfunction of excitation-contraction coupling in myocardium? A: Acidosis B: The obstruction of L-type calcium channels C: The increased activity of myosin ATPase in myocardium D: The increased foetus troponin E: The decreased activity of sarco-endoplasmic reticulum calcium-ATPase

The sac which surrounds the heart is known as the A: myocardium B: pericardium C: mininges D: cardiac apex

In the following description of the heart wall structure, the WRONG option is A: The heart wall consists of endocardium, myocardium and epicardium. B: The surface of endocardium is covered by endothelium. C: Purkinje fibers are distributed in the subendocardial layer of the ventricle (心室). D: Myocardium consists mainly of smooth muscle fibers. E: Epicardium is serosa.

Which<br/>of the followings is the main mechanism of decreased myocardial<br/>contractility induced by acidosis, hyperkalemia?() A: myocardial<br/>energy generation disorder B: myocardial<br/>energy utilization disorder C: myocardial<br/>energy storage disorder D: disorder<br/>of excitation-contraction coupling E: contractive<br/>proteins destruction of myocardium