A&P II - Heart

In order to maintain a stable cardiac output, as stroke volume increases, heart rate A. remains constant B. increases C. decreases D. either increases or decreases depending upon exercise E. either increases or decreases depending upon afterload

B. Increases

The period of isovolumetric contraction takes place during A. atrial systole and ventricular systole B. atrial diastole and ventricular systole C. atrial diastole and ventricular diastole D. atrial systole and ventricular diastole E. ventricular diastole and dicrotic wave

B. atrial diastole and ventricular systole

The ________ circuit carries blood to and from the lungs. A. portal B. pulmonary C. oxygen D. primary E. systemic

B. pulmonary

Which of the following refers to the period of time during a cardiac cycle when contraction occurs and blood pressure rises? A. filling B. systole C. repolarization D. diastole E. fibrillation

B. systole

A slower-than-normal heart rate is called A. procardia. B. hypocardia. C. bradycardia. D. hypercardia. E. tachycardia.

C. bradycardia

The ________ is the amount of blood in a ventricle after it has contracted and before it begins to refill. A. end-diastole volume B. start-diastolic volume C. end-systolic volume D. ejection fraction E. stroke volume

C. end-systolic volume

The pulmonary arteries A. carry oxygen-rich blood to the body B. carry oxygen-poor blood to the left atrium C. carry oxygen-rich blood to the left atrium D. carry oxygen-poor blood to the lungs

D. carry oxygen-poor blood to the lungs

Each of the following factors will increase cardiac output except increased A. force of contraction. B. sympathetic stimulation. C. heart rate. D. parasympathetic stimulation. E. venous return.

D. parasympathetic stimulation.

The second heart sound represents which of the following events? A. valvular stenosis B. semilunar valves opening C. atrioventricular valves closing D. semilunar valves closing E. atrioventricular valves opening

D. semilunar valves closing

This part of the heart can initiate a contraction and can set a constant heart rate of about 100 beats per minute. A. cardiac accelerator nerves B. chemoreceptors C. cardiovascular center D. sinoatrial node E. proprioceptors

D. sinoatrial node

The following are structural components of the conducting system of the heart. 1. Purkinje fibers 2. AV bundle 3. AV node 4. SA node 5. bundle branches The sequence in which excitation would move through this system is A. 4, 3, 2, 5, 1. B. 3, 5, 4, 2, 1. C. 1, 4, 3, 2, 5. D. 4, 2, 3, 5, 1. E. 3, 2, 4, 5, 1.

A. 4, 3, 2, 5, 1.

The P wave on an electrocardiogram (ECG) represents the depolarization of cells in the: A. atria. B. sinoatrial (SA) node. C. ventricles. D. atrioventricular (AV) node.

A. atria

Which of the following vessels supplies blood to the left atrium and left ventricle? A. circumflex branch B. marginal branch C. posterior interventricular branch D. anterior interventricular branch E. coronary sinus

A. circumflex branch

During one cardiac cycle, the ventricles spend most of their time in ________. A. diastole B. systole C. contraction D. depolarization E. fibrillation

A. diastole

Which of the following extend into the auricle? A. pectinate muscles B. interatrial septum C. coronary sulcus D. ventricle E. chordae tendinae

A. pectinate muscles

Which of the following statements is INCORRECT? A. the first heart sound can be described as lubb and results from the SL valves closing after ventricular systole begins B. the second heart sound can be described as dupp and is from the SL valves closing at the end of ventricular systole C. heart sounds comes primarily from turbulence in blood flow created by the closure of heart valves D. although associated with closure of valves, heart sounds are best heard at the surface of the chest in locations that are slightly different form the locations of the valves E. the second dupp heart sound is shorter and not as loud as the first lubb heart sound

A. the first heart sound can be described as lubb and results from the SL valves closing after ventricular systole begins

During ventricular systole, the A. atria are contracting. B. pressure in the ventricles remains constant. C. AV valves are closed. D. pressure in the aorta remains constant. E. blood is entering the ventricles.

C. AV valves are closed

Which of the following is occurring during ventricular diastole? A. The SL valves are open. B. The ventricles are passively filling. C. The ventricles are passively filling and atria are contracting. D. Ventricular ejection. E. The AV valves are closed.

C. The ventricles are passively filling and atria are contracting.

The only site where action potentials can conduct from the atria to the ventricles is the A. atrioventricular node B. sinoatrial node C. atrioventricular (AV) bundle D. bundle branches E. Purkinje fibers

C. atrioventricular (AV) bundle

Which of the following factors would increase stroke volume? A. increased preload, increased afterload, increased contractility B. decreased preload, decreased afterload, decreased contractility C. increased preload, decreased afterload, increased contractility D. decreased preload, increased afterload, increased contractility E. increased preload, increased afterload, decreased contractility

C. increased preload, decreased afterload, increased contractility

Which layer consists of cardiac muscle tissue? A. epicardium B. pericardium C. myocardium D. rndocardium E. hypocardium

C. myocardium

Which of the following is NOT a population of pacemaker cells in the heart? A. Purkinje fiber system B. atrioventricular (AV) node C. papillary muscles D. sinoatrial (SA) node

C. papillary muscles

What normally serves as the pacemaker of the entire heart? A. atrioventricular (AV) node B. Purkinje fiber system C. sinoatrial (SA) node D. atrioventricular (AV) bundle

C. sinoatrial (SA) node

The contraction phase of the cardiac cycle is called depolarization. A. hyperpolarization. B. diastole. C. systole. D. asystole.

C. systole

The first heart sound during the cardiac cycle is caused by blood turbulence due to the closure of which two valves? A. tricuspid and aortic B. bicuspid and pulmonary C. tricuspid and bicuspid D. aortic and pulmonary E. aortic and mitral

C. tricuspid and bicuspid

The T wave on an ECG tracing represents A. atrial repolarization. B. atrial depolarization. C. ventricular repolarization. D. ventricular depolarization. E. ventricular contraction.

C. ventricular repolarization.

What is the volume of blood pumped out of a ventricle with each heartbeat? A. Cardiac output (CO) B. Blood pressure (BP) C. Heart rate (HR) D. Stroke volume (SV)

D. Stroke volume (SV)

When describing the contraction of cardiac muscle fibers, all of the following is correct EXCEPT A. the outflow of potassium ions produces a repolarization B. the pacemaker potential brings the contractile fiber to threshold C. the inflow of calcium ions a plateau of maintained depolarization D. the outflow of sodium ions produces a depolarization E. the refractory period lasts longer than the contraction itself

D. the outflow of sodium ions produces a depolarization

Which event marks the beginning of the cardiac cycle? A. atrial diastole B. atrial arrhythmia C. ventricular diastole D. ventricular systole E. atrial systole

E. atrial systole

Which of the following is used to increase the capacity of the atrium? A. ventricle B. coronary sulcus C. fossa ovalis D. interatrial septum E. auricle

E. auricle

The first heart sound ("lubb") is associated with A. opening of the aortic valve. B. opening of the mitral valve. C. closing of the aortic valve. D. closing of the pulmonary valve. E. closing of the mitral valve.

E. closing of the mitral valve

The right and left atria depolarize and contract following the arrival of the action potential from the: A. atrioventricular (AV) node. B. atrioventricular (AV) bundle. C. Purkinje fibers. E. sinoatrial (SA) node.

E. sinoatrial (SA) node

During ventricular diastole ________. A. only the AV valves close B. the semilunar valves open and the AV valves close C. only the semilunar valves close D. only the AV valves open E. the semilunar valves close and the AV valves open

E. the semilunar valves close and the AV valves open