Chapter 17 function of the heart
Which of the following drug is Sympathomimetic
Beta-1 adrenergic agonist
Which of the following is most likely to relieving anxiety induced trachy trachycardia
Beta-1 adrenergic blocker
Excess vagal stimulation to the SA node is most likely cause
Bradycardia
Which term refers to the heart rate less than 60/min
Bradycardia
Ventricular systole refers to
Contraction of the ventricular myocardium
Which term refers to the amount of blood pumped by the heart in one minute
Cardiac output
Milliliters/beat beat/min defines
Cardiac output
Which of the following is most likely to increase stroke volume
A (+) in the trophic drug
Increases afterload thereby increasing the work of the left ventricle
A stenotic aortic valve
A patient in heart failure is given a drug that is classified as a beta adrenergic Agonist. The drug
Activates the beta-1 adrenergic receptors and causes a positive (+) inotropic
Which of the following is most likely to increase ejection fraction
Activation of beta 1 and adrenergic receptors
Which of the following contains 7 mL
An average stroke volume
Which of the following refers to a positive inotropic effect
An increased myocardial contractile force
Decreased blood flow through the coronary arteries is most likely to cause
Angina pectoris
What is the term for the sequence of events that occur during one heartbeat
Cardiac cycle
Heart rate and stroke volume determine
Cardiac output
It's determined by the heart rate and stroke volume
Cardiac output
Milliliters per minute describe
Cardiac output
Which of the following statement is correct about cardiac output
Cardiac output is determined by heart rate and stroke volume
Sympathetic nerve stimulation of The myocardium
Causes a (+) inotropic effect
An ejection fraction of 30% is
Characteristics a failing heart
Which of the following is the most likely consequence of very rapid heart rate
Decreased ventricular filling with blood
Which of the following is an example of forward failure
Diminished renal blood flow stimulates the kidney to decrease urinary output and retain Na+ and water
Which of the following does not happen to a ventricle
Discharge of the vagal nerve
The amount of blood in the ventricle at the end of it phase is the
End of diastolic volume (EDV) The amount of blood in the ventricles at the end of its resting phase. Preload
Which of the following is responsible for Starling effect
End-diastolic volume (EDV) or preload
Furosemide (Lasix), a potent diuretic is administered in acute ventricular failure to
Excrete excess water and relieve the edema
Vagal stimulation to the heart causes
Heart rate to slow
A drug (e.g., atropine) that blocks the vagus nerve
Increases heart rate
Atropine, a muscarinic blocker
Increases heart rate
An increased preload
Increases stroke volume
Increased afterload (e.g., hypertension)
Increases the work of the heart
Increased return of the blood to the heart stretches the heart muscle thereby
Increasing stroke value
Increased Return of the blood to the heart stretches the muscle thereby
Increasing stroke volume
An elevation pulmonary artery pressure is most likely to cause
Left ventricular failure and pulmonary edema
Atropine is a muscarinic antagonist and is therefore used to
Relieve bradycardia
Which of the following is least related to bradycardia
More than 60 beats/ minute
Systole and diastole describe the function of the
Myocardium
Which of the following is descriptive of vagus nerve
Parasympathetic
Which of the following is most accurately describes the vagus nerve
Parasympathetic
Digoxin, a drug used in the treatment of heart failure, increases contractile force and is therefore called a
Positive (+) inotropic agents
Under what condition is the end diastolic volume most likely to increase while ejection fractions decreases
Positive (+) inotropic response
Starlings law of the heart relates force of myocardial contraction with
Preload
Which of the following is the same as end-diastolic volume
Preload
Most of the symptoms of acute left-sided heart failure are
Respiratory in nature (e.g., dyspnea, orthopnea)
Which of the following is most likely consequence of he left ventricular
Pulmonary edema
Jugular vein distention is most associated with
Right-sided heart failure
A drug causes a positive(+) inotropic effect, a negative(-) dromotropic effect and a negative(-) chronotropic effect. What drug response would you except to observe
Slow heart rate
Activation of the muscarinic receptors by acetylcholine
Slows heart rate
Vagal stimulation on the heart
Slows the heart rate
A change in preload causes a change in myocardial contractile Force. This response is known as a
Starlings law of the heart
An increase in venous return causes an increase in cardiac output. This is accomplished by
Starlings law of the heart
What is the term refers to an increase in stroke volume in response to the stretching of the heart
Starlings law of the heart
Cardiac output is determined by heart rate and
Stroke volume
Which term refers to the amount of blood pumped by The ventricle in One Beat
Stroke volume
Increases heart rate
Sympathetic stimulation to the heart
Which of the following is descriptive of a drug that causes a positive (+) inotropic effect a positive(+) dromotrophic effect, and a positive (+) chronotropic effect
Sympathomimetic
What happens during ventricular diastole
The ventricles are filling with blood
Which of the following is least related to tachydysrhymias
Vagal discharge
Which of the following is not likely to cardiac output
Vagal discharge
Decreases preload
Venodilation
Missouri atrial systole the
Ventricles are relaxed
