22. Ventricular relaxation immediately follows ________. a. atrial depolarization b. ventricular repolarization c. ventricular depolarization d. atrial repolarization.

The coronary arteries arise from the __________.   A right atrium   B inferior vena cava   C aorta   D superior vena cava   E pulmonary trunk

In a normal heartbeat the atria contract ______.   A at exactly the same time as the ventricles   B immediately before the ventricles   C immediately after the ventricles   D at the very beginning of ventricular diastole

An electrocardiogram (ECG) measures the ____.   A difference in electrical potential between two points on the body   B force produced by the ventricles as they contract   C cardiac output   D amount of blood the ventricles eject in a single beat   E membrane potential at which voltage-gated channels will open

( explain well all point of question with step by step answer. )

Blood flow through capillaries in the walls of the left ventricle is ______.   A unnecessary because the myocardiocytes in the wall of the left ventricle get plenty of O2 from the blood they pump   B greatest during diastole; these capillaries are squeezed shut during systole when the surrounding muscle cells contract   C greatest during systole; blood stops following through capillaries during diastole because the heart is relaxed

Pressure in the ventricle would be lowest during _____. atrial systole ventricular systole ventricular diastole isovolumetric relaxation diastisis

In the myogenic response, ________.a. muscle contraction promotes venous return to theheartb. ventricular contraction strength is decreasedc. vascular smooth muscle responds to stretchd. endothelins dilate muscular arteries

The volume of blood ejected from the left ventricle in each beat is ______ the volume ejected by the right ventricle.   A greater than   B equal to   C less than

One difference between the semilunar valves and the atrioventricular valves is that only the semilunar valves ______.   A Are designed to blood flow in both directions   B Have chordae tendineae attached   C Are shaped like pockets   D Have papillary muscles   E All of the above