Exam 9: Cardiac Physiology

Which is the normal sequence of the spread of cardiac excitation? 1. AV node 2. SA node 3. atria 4. Purkinje fibers 5. Bundle of His 6. ventricular myocardium

Indicate the effects of sympathetic and parasympathetic stimulation on the heart using the following answer code: -decreases the rate of depolarization to threshold of the SA node

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

Arteries carry blood away from the ventricles whereas veins carry blood toward the atria.

The heart valves are innervated by the autonomic nervous system.

The SA node is the pacemaker of the heart.

If the cardiac output is 4,800 ml/min, heart rate is 60 beats per minute, EDV is 140 ml. What is ESV?

Why can't tetany of the heart occur?

Match heart characteristic with correct anatomical structure. Choices may be used more than once or not at all. -its closing partially creates the heart sound "lub"

The ____________________ ensures that atrial excitation and contraction are complete before ventricular excitation and contraction commence.

____________________ is the insufficient circulation of oxygenated blood to cardiac muscle to maintain its aerobic metabolism.

Indicate which valve abnormality is being described using the answer code below. -Produces a "gurgling" murmur.

The end-systolic volume is

MATCHING Match term with correct characteristic. -Associated with AV valves

Use the following answer code to compare the magnitude of the items in question. -A. rate of ventricular filling in early diastole B. rate of ventricular filling in late diastole

In response to the presence of LDL or other irritants, the endothelial cells produce chemicals that attract monocytes.

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

Indicate which ion is involved in each event being described by using the following answer code. -Explosive increase in membrane permeability to _____ brings about the rapidly rising phase of the action potential in contractile cardiac cells.

Atrial systole lasts throughout ventricular systole.

A pacemaker potential depends on the increased inward current of calcium ions.