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Into which chamber of the heart do the superior vena cava, inferior vena cava, and coronary sinus return deoxygenated blood?
Which chamber of the heart sends oxygenated blood to the aorta to the systemic circuit?
Cardiac tamponade results in ineffective pumping of blood by the heart because the excessive amount of fluid in the pericardial cavity will_____
prevent the heart from filling properly with blood
The presence of an incompetent tricuspid valve would have the direct effect of causing ______
reduced efficiency in the delivery of blood to the lungs
The layers of the heart wall from superficial to deep are: __________.
epicardium, myocardium, and endocardium
Which layer of the heart wall contracts and is composed primarily of cardiac muscle tissue?
In an ischemic heart, the affected cardiac muscle cells are likely to have an altered ______.
resting membrane potential, The damaged tissue is normally replaced by scar tissue that lacks the normal cell structure of the original tissue. So "scarred" cardiac muscle would lack the pumps and channels that are necessary to establish resting membrane potential.
Which functional feature best describes the manner in which cardiac muscle contracts?
Automaticity (autorhythmicity) promotes the spontaneous contraction of the cardiac muscle cells.
The first heart sound (the 'lub' of 'lub-dup') is caused by:
closure of the atrioventricular valves.
Which portion of the electrocardiogram represents the depolarization wave received from the sinoatrial (SA) node through the atria?
Which portion of the electrocardiogram represents the time during which the atria repolarize?
At what point in the cardiac cycle is pressure in the ventricles the highest (around 120 mm Hg)?
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