Chapter 19 Pt. 2 (AP II)

a person with a heart rate of 75 beats per minute and a stroke colume of 60mL per beat has a cardiac output of

4500 mL/minute

Given an end diastolic volume (EDV) of 120 mL/beat and an end systolic volume (ESV) of 50 mL/beat, the stroke volume (SV) would be

70 mL/beat

Which letter represents atrial depolarization?

A

Select the correct statement about cardiac output

A slow heart rate increases end diastolic volume, stroke volume, and force of contraction

Which letter represents ventricular depolarization?

B

Which letter represents the beginning of ventricular repolarization?

D

Select the correct statement about the heart valves

The atrioventricular (AV) valves prevent backflow of blood into the atria during ventricular contraction

Select the correct statement about the function of myocardial cells

The entire heart contracts as a unit or it does not contract at all

Chest pain resulting from the loss of oxygen to heart cells is called

angina pectoris

which of the following receive(s) blood during ventricular systole?

both the aorta and pulmonary trunk

During ventricular systole, the AV valves are __________ and the semilunar valves are ___________

closed; open

During which phase of the heartbeat does the heart fill with blood?

diastole

The amount of blood remaining in the ventricle when the semilunar valve closes is the

end-systolic volume

Which of the following increases heart rate?

epinephrine

Which of these events is NOT associated with ventricular systole

heart is relaxed

Exercise results in skeletal muscles compressing veins which encourages blood to return to the heart. In this scenario, which of the following is correct?

preload increases

The main function of the AV node is to

relay the signal to contract to the ventricles

Which one of the following represents the correct path for the transmission of an impulse in the intrinsic conduction system of the heart:

sinoatrial (SA) node, atrioventricular (AV) node, atrioventricular (AV) bundle, right and left bundle branches, Purkinje fibers

The specific location of the heart pacemaker is the

sinoatrial node

The volume of blood pumped out by each ventricle with each beat of the heart is called the

stroke volume

Which one of the following is true concerning the "lub-dub" sounds of the heart

the first sound is longer and louder and is caused by closure of the AV valves; the second sound is shorter and sharper and is caused by closure of the semilunar valves

The amount of blood returning to the heart is the

venous return

Which of the events below does NOT occur when the semilunar valves are open?

ventricles are in diastole