A&P 2 Lab - Ex 45 Cardiac Cycle

The _________ node is located in the inferior portion of the interatrial septum. A. AV B. SA C. purkinje

A. AV

The depolarization of atrial fibers is represented by the __________ of an ECG. A. P wave B. QRS complex C. T wave D. P-Q interval

A. P wave

Normally, the _________ node serves as the pacemaker of the heart. A. SA B. AV

A. SA

The __________ of the conduction system is known as the pacemaker. A. SA node B. AV node C. AV bundle D. left bundle branch

A. SA node

The __________ of the conduction system is located in the interventricular septum. A. SA node B. AV node C. AV bundle D. Purkinje fiber

A. SA node

Which portion(s) of the cardiac conduction system is/are found in the right atrium of the heart? A. SA node and AV node B. AV bundle and the bundle branches C. Purkinje fibers D. AV bundle E. SA node

A. SA node and AV node

Which of the following portions of the ECG represents ventricular repolarization? A. The T wave B. The P-R segment C. The QRS complex D. The P wave E. The P-R interval

A. The T wave

A(n) electrocardiogram is a recording of electrical changes occurring in the myocardium during a cardiac cycle. A. True B. False

A. True

The dupp sound occurs when the semilunar valves are closing during ventricular diastole. A. True B. False

A. True

The pulmonary and aortic valves open when the pressure in the ventricles exceeds the pressure in the pulmonary trunk and aorta. A. True B. False

A. True

The sound created when blood leaks back through an incompletely closed valve is called a murmur. A. True B. False

A. True

There is a short period of time in the cardiac cycle, in which all four heart chambers are in diastole. A. True B. False

A. True

During ventricular contraction the AV valves (tricuspid and mitral valves) are _______, while during ventricular relaxation the AV valves are __________. A. closed, open B. open, closed

A. closed, open

Once the AV node has been signaled, the rapid continuation of the electrical signal occurs through the AV bundle and the right and left bundle branches within the interventricular septum and terminates via the ___________ throughout the ventricular walls. A. purkinje fibers B. chordae tendineae C. tabeculae carneae D. papillary muscles

A. purkinje fibers

The T wave corresponds to the _______________ of the muscle fibers of the ventricles. A. repolarization B. depolarization

A. repolarization

The SA node of the heart is located in the A. right atrium. B. left atrium. C. left ventricle. D. right ventricle.

A. right atrium.

The period during which a heart chamber is contracting is called __________, while the period during which a heart chamber is relaxing is called _____________ . A. systole, diastole B. diastole, systole

A. systole, diastole

The QRS complex corresponds to the depolarization of the muscle fibers of the _____________. A. ventricle B. atria

A. ventricle

Which structure of the cardiac conduction system is considered the final component of the system? A. SA node B. AV bundle C. Purkinje fibers D. Left and right bundle branches E. AV node

C. Purkinje fibers

One cardiac cycle would consist of A. left chamber contractions followed by right chamber contractions. B. right chamber contractions followed by left chamber contractions. C. atrial chamber contractions followed by ventricular chamber contractions. D. ventricular chamber contractions followed by atrial chamber contractions.

C. atrial chamber contractions followed by ventricular chamber contractions

The __________ of the conduction system is/are located throughout the ventricular walls. A. AV node B. left bundle branch C. right bundle branch D. Purkinje fibers

D. Purkinje fibers

The second of two heart sounds (dupp) occurs when the A. AV valves open. B. AV valves close. C. semilunar valves open. D. semilunar valves close.

D. semilunar valves close.

Which of the components of the cardiac conduction system briefly delays the signal from the pacemaker, so that the atria have time to fill the ventricles with blood, before the ventricles begin to contract? A. AV bundle B. SA node C. Purkinje fibers D. Left and right bundle branches E. AV node

E. AV node

The large fibers on the distal side of the AV node make up the ___________. A. SA bundle B. AV bundle C. purkinje fibers D. bundle branch

B. AV bundle

The first of two heart sounds (lubb) occurs when the A. AV valves open. B. AV valves close. C. semilunar valves open. D. semilunar valves close

B. AV valves close.

Functionally, how is cardiac muscle tissue controlled, compared to that of skeletal muscle tissue? A. Both cardiac and skeletal muscle tissue are controlled by somatic motor neurons. B. Cardiac muscle tissue is controlled by pacemaker cells within the heart, while skeletal muscle tissue is regulated by somatic motor neurons. C. Cardiac and skeletal muscle tissue are controlled by both somatic motor neurons and by pacemaker cells within the respective tissues. D. Both cardiac and skeletal muscle tissue are controlled by pacemaker cells within the respective tissues. E. Cardiac muscle tissue is controlled by somatic motor neurons, while skeletal muscle tissue is controlled by pacemaker cells within the tissue.

B. Cardiac muscle tissue is controlled by pacemaker cells within the heart, while skeletal muscle tissue is regulated by somatic motor neurons.

During the cardiac cycle, the left atrium and ventricle contract simultaneously, and then the right atrium and ventricle contract at the same time. A. True B. False

B. False

Following the second heart sound, the ventricles eject blood. A. True B. False

B. False

The P wave of an ECG occurs during the repolarization of the atria. A. True B. False

B. False

Depolarization of the ventricles is represented by ____________ in an ECG recording. A. P wave B. QRS complex C. T wave

B. QRS complex

The depolarization of ventricular fibers is indicated by the __________ of an ECG. A. P wave B. QRS complex C. T wave D. P-Q interval

B. QRS complex

The __________ of the conduction system is located in the right atrium near the entrance of the superior vena cava. A. AV node B. SA node C. right bundle branch D. Purkinje fibers

B. SA node

The P wave corresponds to the depolarization of the muscle fibers of the __________. A. ventricle B. atria

B. atria