Exam 8: Cardiac Physiology

The AV and semilunar valves are never open at the same time.

The only point of electrical contact between the atria and the ventricles is the AV valve.

Which of these statements applies to extrasystole of the heart

Which of these events occurs at rapid heart rates

Match the pressure relationships, labelled a. through e., with the times in question. (Options may be used more than once or not at all.) -when ventricular ejection is occurring

Match the pressure relationships, labelled a. through e., with the times in question. (Options may be used more than once or not at all.) -during isovolumetric ventricular relaxation

The stroke volume is the total volume of blood ejected by both ventricles per minute.

Which of these events occurs due to sympathetic stimulation of the heart

PAF is released from the ____________________ lining of vessels.

Match the effects with sympathetic or parasympathetic stimulation (or neither) of the heart. (Options may be used more than once or not at all.) -increases the heart rate

Twelve complete ECG patterns are recorded from a subject over 10 seconds.If this pattern continues, what is the rate of the heartbeat in the subject

Arteries carry blood toward the ventricles.

The extent of ventricular filling is the preload of the heart, whereas the magnitude of the arterial blood pressure is the afterload of the heart.

Which of these statements describes cardiac output

Which of these actions happens during heart failure

What is a metabolic predictor of heart disease that is independent of one's cholesterol/lipid profile

The tricuspid prevents regurgitation of blood from the right ventricle back into the right atrium.

The electrocardiogram is most useful in determining which component of cardiac output

What is the membrane potential of cardiac muscle cells at rest

Compare the magnitude of the items in question by using the answer code (options may be used more than once or not at all): a.A is greater than B b.B is greater than A c.A and B are equal a.resistance and pressure in the pulmonary circulation B.resistance and pressure in the systemic circulation a.volume of blood pumped out by the left side of the heart B.volume of blood pumped out by the right side of the heart a.spontaneous rate of depolarization in the SA node B.spontaneous rate of depolarization in the ventricles a.velocity of impulse through the bundle of His and Purkinje system B.velocity of impulse conduction through the AV node a.rate of depolarization of the SA node on parasympathetic stimulation B.rate of depolarization of the SA node on sympathetic stimulation a.duration of systole at resting heart rate B.duration of systole at rapid heart rate during exercise a.duration of diastole at resting heart rate B.duration of diastole at rapid heart rate during exercise a.rate of ventricular filling in early diastole B.rate of ventricular filling in late diastole a.stroke volume when end-diastolic volume equals 130 mL B.stroke volume when end-diastolic volume equals 160 mL a.normal stroke volume B.stroke volume on sympathetic stimulation a.volume of blood in the ventricles at the onset of isovolumetric ventricular contraction B.volume of blood in the ventricles at the end of isovolumetric ventricular contraction a.volume of blood in the left ventricle when the aortic valve opens B.volume of blood in the left ventricle when the aortic valve closes a.volume of blood in the left ventricle when the left AV valve opens B.volume of blood in the left ventricle when the left AV valve closes a.duration of the refractory period in cardiac muscle B.duration of contraction in cardiac muscle a.duration of the refractory period in cardiac muscle B.duration of the refractory period in skeletal muscle a.coronary blood flow during systole B.coronary blood flow during diastole