Veneil AP CH 17

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45 terms

Systole and diastole describe the function of the

myocardium

During atrial systole, the

ventricles are relaxed

What happens during ventricular diastole?

the ventricles are filling with blood

Which of the following is the most likely consequence of a very rapid heart rate?

decreased ventricular filling (with blood)

Which of the following does not happen to a ventricle?

discharge of the vagal nerve

Which of the following is most likely to relieve an anxiety-induced tachycardia?

beta1 adrenergic blocker

Which of the following is responsible for the Starling effect?

end diastolic volume (EDV)

Which of the following is most likely to increase stroke volume?

a (+) inotrpic drug

Which of the following is most likely to increase ejection fraction?

activation of beta1 adrenergic receptors

Which of the following is the same as end dialostic volume?

preload

What terms refers to the amount of blood pumped by the ventricle in one boat?

stroke volume

Which term refers to the amount of blood pumped by the heart in one minute?

cardiac output

Sympathetic nerve stimulation of the myocardium

causes a (+) inotropic effect

Vagal stimulation to the heart causes

heart rate to slow

Excess vagal stimulation to the SA node is most likely to cause

bradycardia

Which of the following is descriptive of the vagus nerve?

parasympathetic

Heart rate and stroke volume determine

cardiac output

A drug (i.e., atropine) that blocks the vagus nerve

increases the heart rate

Activation of the muscarinic receptors by acetylcholine

slows heart rate

Decreased blood flow through the coronary arteries is most likely to cause

angina pectoris

This term refers to a heart rate of fewer that 60 beats/min

bradycardia

Vagal stimulation on the heart

slows the heart rate

Which of the following most accurately describes the vagus nerve?

parasympathetic

What is the term for the sequence of events that occur during one heartbeat?

cardiac cycle

Which of the following contains 70ml?

an average stroke volume

Which of the following refers to a positive inotropic effect?

an increased myocardial contractile force

Sympathetic stimulation to the heart

increases heart rate

Cardiac output is determined by heart rate and

stroke volume

What is the term that refers to an increase in stroke volume in response to the stretching of the heart?

Starling's law of the heart

Atropine is a muscarinic antagonist and is therefore used to

relieve bradycardia

Which of the following is descriptive of a drug that causes a (+) inotropic effect, a (+) dromotropic effect, and a (+) chronotropic effect?

sympathomimetic

Which of the following drugs is sympathomimetic?

beta1 adrenergic agonist

An increased afterload (e.g., hypertension)

increases the work of the heart

An increased preload

increases stroke volume

Cardiac output

is determined by heart rate and stroke volume

Increased return of the blood to the heart stretches the muscle, thereby

increasing stroke volume

An ejection fraction of 30% is

characteristic of a failing heart

A stenotic aortic valve

increases afterload, thereby increasing the work of the left ventricle

Which of the following is the most likely consequence of acute left ventricular failure?

pulmonary edema

Most of the symptoms of acute left-sided heart failure are

respiratory in nature (e.g., dyspnea, orthopnea)

Which of the following is an example of forward failure?

diminished renal blood flow stimulates the kidney to decrease urinary output and to retain Na+ and water

Furosemide (Lasix), a potent diuretic, is administered in acute ventricular failure in order to

excrete excess water and relieve the edema

Digoxin, a drug used in the treatment of heart failure, increases contractile force and is therefore called a

(+) inotropic agent

An increase in venous return causes an increase in cardiac output. This is accomplished by

Starling's law of the heart

Milliliters/beat x beats/minute defines

cardiac output

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