A&P 2 Chapter 19 test review questions

S3

Heart sound __________ is thought to result from the transition from expansion of the empty ventricles to their sudden filling with blood. S1 S2 S3 S4

Ventricles

What are the thick inferior chambers of the heart that pump blood into the arteries called? Ventricles Atria Auricles AV valves

Autorhythmic

What is the ability to rhythmically depolarize without outside stimulation called? Autorhythmic Automatic Myogenic Contractile

Base

What is the broad flat superior top portion of the heart called? Base Apex Origin Border

Pericardium

What is the double layered sac that surrounds the heart called? Pericardium Epicardium Pericardial cavity Endocardium

the atrioventricular valves open

When the pressure in the ventricles becomes lower than the pressure in the atria, __________. the ventricles contract blood flows into the pulmonary trunk blood flows into the aorta the atrioventricular valves open the semilunar valves open

delay of the action potential between the SA and AV nodes

A first degree block is caused by ________________. delay of the action potential between the AV and SA nodes delay of the action potential between the AV node and Purkinje fibers delay of the action potential between the SA node and Purkinje fibers delay of the action potential between the SA and AV nodes

2:1 ratio of P waves to QRS complexes

An ECG tracing from someone with a third-degree AV block is best described as a tracing with a ______________________. 2:1 ratio of P waves to QRS complexes 1:1 ratio of P waves to QRS complexes 1:1 ratio of T waves to QRS complexes 1:2 ratio of P waves to QRS complexes

negative; decrease

An individual with high blood pressure (hypertension) is expected to benefit from the administration of ____________________ inotropic drugs that _______________ the hearts workload. positive; decrease negative; increase negative; decrease positive; increase

It increases.

As a heart chamber contracts, what happens to the pressure of the fluid within it? It increases. It decreases. It neither increases or decreases.

None of these choices is correct.

If a person's heart is pumping 5000 mL of blood in one minute and the heart rate is 50 beats per minute, what is the cardiac output? 250,000 mL/min 25,000 mL/min 100 mL/min 1000 mL/min None of these choices is correct.

sinoatrial node

In the heart, an action potential originates in the __________. Purkinje fibers bundle branches atrioventricular bundle atrioventricular node sinoatrial node

more; decreasing

Positive inotropes allow the heart to pump ____________ blood with fewer heart beats. They do this by _____________________ the end-systolic volume (ESV). more; increasing more; decreasing less; increasing less; decreasing

contraction force

The Frank-Starling law of the heart states that an additional stretch of the myocardium produces a significant increase in __________ on the next beat. contraction force afterload electrical activity cardiac reserve None of the choices are correct.

ventricular systole and early to mid ventricular diastole

The atria remain in diastole throughout both the _______________________ phases of the cardiac cycle. early and late ventricular diastole ventricular systole and ventricular diastole early and late ventricular systole ventricular systole and early to mid ventricular diastole

ventricular diastole

The atrioventricular valves open during __________. ventricular systole ventricular diastole atrial systole atrial diastole both atrial and ventricular systole

cardiac reserve

The difference between the maximum and resting cardiac output is called __________. cardiac reserve preload stroke volume afterload contractility

strengthen; increase

The expected effect of the drug Digoxin is to _________________ ventricular contraction and _________________ stroke volume. strengthen; decrease weaken; increase weaken; decrease strengthen; increase

Atrioventricular

The passage of blood from the atria to the ventricles is regulated by which valves? Atrioventricular Semilunar Pulmonary Interventricular

the number of QRS complexes present within a specific unit of time

The rate of ventricular conduction is best determined by the _______________________ on an ECG. the number of QRS complexes present within a specific unit of time the number of T waves present within a specific unit of time the number of P waves present within a specific unit of time

ventricular diastole

The semilunar valves close during __________. ventricular systole ventricular diastole atrial systole atrial diastole both atrial and ventricular systole

late ventricular systole

The semilunar valves remain open throughout the ____________________ phase of the cardiac cycle. early ventricular systole atrial systole late ventricular systole ventricular diastole

Sinoatrial node, atrioventricular node, atrioventricular bundle, bundle branches, Purkinje fibers

Which of the following is the correct sequential path of an action potential in the heart? Sinoatrial node, atrioventricular node, atrioventricular bundle, bundle branches, Purkinje fibers Atrioventricular node, sinoatrial node, atrioventricular bundle, bundle branches, Purkinje fibers Atrioventricular bundle, atrioventricular node, sinoatrial node, bundle branches, Purkinje fibers Purkinje fibers, atrioventricular bundle, atrioventricular node, sinoatrial node, bundle branches Atrioventricular node, sinoatrial bundle, atrioventricular node, bundle branches, Purkinje fibers

Action potentials pass slowly through the atrioventricular node.

Which of the following is true concerning the heart's conduction system? Action potentials pass slowly through the atrioventricular node. Action potentials pass slowly through the atrioventricular bundle. Action potentials pass slowly through the Purkinje fibers. Action potentials pass slowly through the ventricle wall. Action potentials pass slowly through the bundle branches.

Diastole

Which term refers to relaxation of the heart? Diastole Systole Asystole