Exam 9: Cardiac Physiology

Cardiac output

Indicate which ion is involved in each event being described by using the following answer code. -Inactivation of _____ channels brings about the slow drift of membrane potential to threshold in the cardiac autorhythmic cells.

Use the answer code below to complete the following statements. -The volume of blood ejected by each ventricle each beat is known as the _____.

Use the following answer code to indicate which factor involved in the initiation and spread of cardiac excitation is being identified. -Allows the impulse to spread from cell to cell.

Cardiac muscle receives its blood supply primarily during ventricular systole when blood is being pumped out into the aorta.

This inflammatory response decrease the progression of heart disease.

Match heart characteristic with correct anatomical structure. Choices may be used more than once or not at all. -this overcomes the afterload of the circuits

Using the following answer code, indicate which pressure relationship exists during the time in question. -when the atrioventricular valve opens

An increase in stroke volume ____________________ the cardiac output.

According to the Frank-Starling law of the heart, the greater the stroke volume, the smaller the subsequent end-diastolic volume will be, because as more blood is squeezed out, the heart cannot fill as completely during the next diastole.

The ____ nerves to the heart alter cardiac output by decreasing heart rate.

The direction of the impulse through the conduction system of the heart for each cardiac cycle is normally

Use the following answer code to compare the magnitude of the items in question. -A. Coronary blood flow during systole B. Coronary blood flow during diastole

An increase in parasympathetic activity ____________________ the rate of depolarization of the SA node.

The right half of the heart pumps blood through the ____ circuit and the left half pumps blood through the ____ circuit.

Using the following answer code, indicate which pressure relationship exists during the time in question. -when the atrioventricular valve closes

The AV nodal delay

The end-diastolic volume is always greater than stroke volume.

Indicate the effects of sympathetic and parasympathetic stimulation on the heart using the following answer code: -increases the AV nodal delay

An increase in cardiac sympathetic activity ____________________ the velocity of impulse conduction through the heart.