Exam 8: Cardiac Physiology

Which of these molecules induces vasodilation of coronary arteries

Which of these statements does NOT describe cardiac muscle cells

Which of the following is the normal pacemaker of the heart

An increase in venous return ____________________ the end-diastolic volume.

The semilunar valves are positioned between the atria and ventricles.

An increase in heart rate ____________________ the cardiac output.

Match the factor involved in the initiation and spread of cardiac excitation, labelled a. through d. with the description. (Options may be used more than once or not at all.) -rapidly conducts the impulse down the ventricular septum and throughout much of the ventricular musculature

Diastole refers to the period of cardiac relaxation.

Which of the following occurrences causes the dicrotic notch on the aortic pressure curve

Match the effects with sympathetic or parasympathetic stimulation (or neither) of the heart. (Options may be used more than once or not at all.) -decreases the rate of depolarization to threshold of the SA node

If the stroke volume is 80 mL and the heart rate is 70 beats per minute, what is the cardiac output

Gap junctions are absent between atrial and ventricular cells.

Match the term, labelled Match the term, labelled a. through g., with their correct characteristic. -encircles the heart and secretes a lubricating fluid

An increase in venous return ____________________ the stroke volume.

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 AV nodal delay

Not all forms of LDL are equally harmful to the heart.

What component of the cardiac conduction system distributes electrical signals through the papillary muscles directly

The function of the chordae tendineae and papillary muscles is to hold the AV valves wide open during diastole to ensure complete ventricular filling.

The ____________________ is the volume of blood in the ventricle when ejection is complete.

An increased ESV ____________________ the stroke volume.