Week 2 Flashcards
(35 cards)
The PRODUCT of the stroke volume times the heart rate is known as the
SELECTone:
a. end-diastolic volume.
b. end-systolic volume.
c. cardiac output.
d. cardiac reserve.
e. venous return.
c. cardiac output.
In a normal electrocardiogram, the
SELECTone:
a. P wave results from repolarization of the atria.
b. QRS complex results from ventricular depolarization.
c. P wave occurs after the QRS complex but before the T wave.
d. T wave represents depolarization of the atria.
e. repolarization of the atria is clearly visible.
b. QRS complex results from ventricular depolarization.
Blood in the superior vena cava will ENTER the _____.
SELECTone:
a. aorta
b. right atrium
c. pulmonary trunk
d. pulmonary arteries
e. pulmonary veins
b. right atrium
Which of the FOLLOWING sequences is correct?
SELECTone:
a. AV node, AV bundle, SA node, Purkinje fibers, bundle branches
b. Purkinje fibers, bundle branches, AV node, AV bundle, SA node
c. SA node, AV node, AV bundle, bundle branches, Purkinje fibers
d. SA node, AV bundle, AV node, bundle branches, Purkinje fibers
e. AV node, SA node, bundle branches, AV bundle, Purkinje fibers
c. SA node, AV node, AV bundle, bundle branches, Purkinje fibers
these vessels transport blood to the right and left lungs.
SELECTone:
a. aorta
b. right atrium
c. pulmonary trunk
d. pulmonary arteries
e. pulmonary veins
d. pulmonary arteries
Blood vessels ENTER and exit from the _____ of the heart.
SELECTone:
a. apex
b. base
c. auricles
d. trigone
e. inferior aspect
b. base
If the heart receives more sympathetic stimulation than parasympathetic stimulation, the heart will
SELECTone:
a. increase its rate and force of contraction.
b. contract with greater force but at a slower rate.
c. decrease both its rate and force of contraction.
d. contract with less force but at a faster rate.
e. decrease rate, but increase force of contraction.
a. increase its rate and force of contraction.
The “pacemaker” of the heart is the
SELECTone:
a. right bundle branch.
b. left bundle branch.
c. AV node.
d. SA node.
e. PM node.
d. SA node.
The tricuspid valve is closed
SELECTone:
a. during active filling of the ventricles.
b. when the mitral valve is open.
c. while the atria are contracting.
d. during ejection.
e. during passive filling of the ventricles.
d. during ejection.
An incompetent pulmonary semilunar valve could RESULT in less blood reaching the
SELECTone:
a. lungs.
b. heart muscle.
c. right ventricle.
d. aorta.
e. right atrium.
a. lungs.
The AV valve that is located on the same side of the heart as the origin of the aorta is the
SELECTone:
a. bicuspid or mitral valve.
b. tricuspid valve.
c. aortic semilunar valve.
d. pulmonary semilunar valve.
e. coronary sinus valve.
a. bicuspid or mitral valve.
Contraction of the ventricles is referred to as ventricular
SELECTone:
a. systole.
b. diastole.
c. fibrillation.
d. ischemia.
e. depolarization.
a. systole.
Cardiac muscle cells
SELECTone:
a. have smooth ER but no T tubules.
b. form the heart valves.
c. are maintained by an extensive capillary network.
d. develop a significant oxygen debt during systole.
e. do not contain actin and myosin like skeletal muscle cells.
c. are maintained by an extensive capillary network.
The P wave of an ECG INDICATES
SELECTone:
a. atrial depolarization.
b. atrial repolarization.
c. ventricular depolarization.
d. ventricular repolarization.
e. threshold.
a. atrial depolarization.
Which of the following phrases would APPLY to cardiac muscle cells?
SELECTone:
a. are organized in parallel columns or bundles
b. contain actin but no myosin
c. develop a significant oxygen debt during systole
d. are multinucleated like skeletal muscle cells.
e. possess special cell-to-cell contacts called intercalated discs
e. possess special cell-to-cell contacts called intercalated discs
The volume of blood pumped during each cardiac cycle is the
SELECTone:
a. stroke volume.
b. cardiac output.
c. cardiac reserve.
d. end-systolic volume.
e. end-diastolic volume.
a. stroke volume.
The valve located between the right ventricle and the pulmonary trunk is the
SELECTone:
a. aortic semilunar valve.
b. pulmonary semilunar valve.
c. tricuspid valve.
d. mitral valve.
e. bicuspid valve.
b. pulmonary semilunar valve.
Coronary artery disease can diminish myocardial blood flow RESULTING in the death of myocardial cells. This condition is known as a myocardial
SELECTone:
a. attack.
b. angina.
c. necrosis.
d. cirrhosis.
e. infarction.
e. infarction.
If cardiac muscle cells are unable to repolarize, this would cause
SELECTone:
a. cardiac output to increase.
b. no harm. These cells can spontaneously depolarize anyway.
c. the heart rate to decrease. It might cause cardiac arrest.
d. an increased demand on mitochondria to produce more ATP.
e. tachycardia.
c. the heart rate to decrease. It might cause cardiac arrest.
Blood in the pulmonary veins returns to the
SELECTone:
a. right atrium.
b. left atrium.
c. right ventricle.
d. left ventricle.
e. coronary sinus
b. left atrium.
Which of the FOLLOWING is true?
SELECTone:
a. Blood enters the right and left atria only during diastole.
b. Most ventricular filling occurs before the atria contract.
c. During ventricular systole, the AV valves open.
d. The semilunar valves remain closed throughout ventricular systole.
e. Most of end-diastolic volume comes from active filling.
b. Most ventricular filling occurs before the atria contract.
The long refractory period observed in cardiac muscle
SELECTone:
a. prolongs depolarization of the cardiac muscle.
b. prevents tetanic contractions of the cardiac muscle.
c. ensures that the heart has adequate time to contract.
d. prevents the heart rate from slowing down.
e. prevents an increase in heart rate.
b. prevents tetanic contractions of the cardiac muscle.
In the cardiac cycle
SELECTone:
a. the right atrium and the right ventricle contract simultaneously.
b. the two atria relax while the two ventricles contract.
c. the left atrium contracts before the right atrium.
d. all four chambers of the heart contract at the same time.
e. all four chambers of the heart are in systole at the same time.
b. the two atria relax while the two ventricles contract.
Which of the following layers forms the BULK of the heart wall?
SELECTone:
a. epicardium
b. pericardium
c. endocardium
d. myocardium
e. visceral pericardium
d. myocardium
