chapter 17

Réussis tes devoirs et examens dès maintenant avec Quizwiz!

End-diastolic volume (EDV) for each ventricle at the end of atrial systole is normally about:

120ml

A damaged right bundle branch will prevent the passage of the action potential to the

Purkinje fibers in the right ventricle.

Which wave on the electrocardiogram (ECG) represents ventricular depolarization?

QRS wave

Which of the following can be used to measure heart rate

R-R interval

What best describes the Frank-Starling law?

The Frank-Starling law states that the more the ventricular muscle cells are stretched, the more forcefully they contract.

The long length of the cardiac action potential, at 200-300 msec, allows for

an opportunity for the heart to fill with blood

Where should the left ventricle send blood

aorta

Which vessel supplies the systemic circuit with oxygenated blood

aorta

he right and left coronary arteries receive blood from the

aorta

The P wave on an electrocardiogram (ECG) represents the depolarization of cells in the

atria

Which hormone decreases cardiac output by decreasing blood volume and preload?

atrial natriuretic peptide (ANP)

What is NOT part of the cardiac conduction system

atrioventricular (AV) valve

Which valve is situated between the left atrium and left ventricle

bicuspid (mitral) valve

Which of the following volumes should be the greatest?

cardiac output (CO)

Autorhythmicity in the heart is the responsibility of

cardiac pacemaker cells

Inotropic agents affect

contractility

Generally, coronary veins empty into a vessel known as the

coronary sinus

The right side of the heart receives:

deoxygenated blood from the systemic circuit

The visceral pericardium is the same as the

epicardium

What is the most superficial layer of the pericardial sac

fibrous pericardium

the rapid influx of calcium ions into pacemaker cells creates a positive membrane potential inside the cell and is responsible for the

full depolarization phase

Coronary circulation involves the delivery of oxygenated blood to the

heart

what characteristic differentiates cardiac muscle cells from skeletal muscle cells?

intercalated discs

What surface groove separates the right and left ventricle

interventricular sulcus

he apex of the heart is situated toward the

left hip

Which chamber experiences a maximum pressure of around 118 mm Hg during contraction

left ventricle

The pulmonary circuit involves blood flow from the heart to the

lungs

The heart is situated in the middle of the thoracic cavity in a region known as

mediastinum

What muscles, present in the ventricles, anchor the atrioventricular valves by tendon-like chords called chordae tendineae?

papillary muscle

Which of the following is NOT a population of pacemaker cells in the heart?

papillary muscles

What is found between the visceral pericardium and the parietal pericardium

pericardial fluid

During what phase of the action potential will calcium ions enter the contractile cell as potassium ions exit?

plateau phase

The degree of stretch experienced by the sarcomeres in the ventricle cells before they contract is called

preload.

What is the function of the valves in the

prevent backflow of blood through the hear

Which vessel is guarded by a semilunar valve at its base

pulmonary trunk

hich of the following does NOT return blood to the right atrium of the heart

pulmonary vein

hich of the following vessels carries oxygenated blood

pulmonary vein

What valve prevents the backflow of blood from the right ventricle into the right atrium

ricuspid valve

Blood in the right ventricle arrived from the

right atrium

What normally serves as the pacemaker of the entire heart

sinoatrial (SA) node

As ventricular systole begins, all four heart valves are closed during the

sovolumetric contraction phase.

The volume of blood pumped by each ventricle in one heartbeat is known as:

stroke volume (SV

What two values are needed in order to calculate cardiac output (CO) for a ventricle?

stroke volume (SV) and heart rate (HR)

Archie has a resting heart rate of 125 beats per minute. Classify his cardiac dysrhythmia.

tachycardia

As a result of the long refractory period in the contractile cell, cardiac muscle can NOT exhibit

tetany.

Predict the position of the valves during the ventricular ejection phase

the AV valves are shut while both semilunar valves are forced open

Afterload is described as:

the amount of blood that has drained into the ventricle by the end of the filling phase

What produces the "lub dub" heart sounds?

the vibrations of the ventricular and blood vessel walls when valves shut

Both the left and right atria receive blood from:

veins

During what phase does blood flow from the ventricles into the pulmonary trunk and aorta?

ventricular ejection phase


Ensembles d'études connexes

Production and Resource Use Practice Problems

View Set

Pediatrics Exam 4 NCLEX Questions Pt 1

View Set

Literary Terms- Figures of Speech

View Set