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the heart questions

QuestionAnswer
the second heart sound is produced by the closing of what valves? The semilunar valves ( aortic and pulmonary)
What is the back up pacemaker if the first one should fail? The A-V node
when pacemaker cells are polarized... the concentration of sodium ions is higher on the outside of the cell than on the inside and cont concentration of potassium is higher inside than out.
If the A-V node was functioning as the pacemaker, what would be seen on the EKG? No P-wave
which layer of the heart prevents clots from forming in the AV Valves? The endocardium
name 3 vessels that carry deoxygenated blood Coronary sinus, pulmonary arteries and the vena cavas.
what carries deoxygenated blood through the abdominal cavity? The inferior vena cava
When the ventricles are filling, the ___________ valves are closed. semilunar valves (aortic and pulmonary)
The loose fitting sac around the heart is called the pericardium
The heart is self stimulating because of special _______ channels that are always open. Sodium
the outer layer of the heart wall is called the epicardium and the visceral pericardium
what 2 structures prevent the cusps of the AV valves from swinging up into the atria? papillary muscles and the chordae tendineae
What valves are closed during ventricular systole? the AV valves (tricuspid and mitral)
Created by: 688472874