Filters
Question type

Study Flashcards

What occurs during the time between the first heart sound and the second heart sound?


A) ventricular systole
B) ventricular diastole
C) ventricular filling
D) atrial systole
E) the P wave of the ECG

F) A) and D)
G) C) and E)

Correct Answer

verifed

verified

Cardiac muscle cells


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.

F) C) and D)
G) B) and C)

Correct Answer

verifed

verified

The procedure whereby a small balloon is placed into a partially occluded coronary artery and then inflated to increase blood flow through the artery is called a(n)


A) angioplasty.
B) coronary bypass.
C) urokinase injection.
D) tissue plasminogen activation.
E) angiogram.

F) A) and E)
G) All of the above

Correct Answer

verifed

verified

The pericardial sac is lined with


A) fibrous pericardium.
B) parietal pericardium.
C) visceral pericardium.
D) myocardium.
E) epicardium.

F) A) and E)
G) A) and D)

Correct Answer

verifed

verified

Action potentials pass from one myocardial cell to another through areas of low electrical resistance called


A) gap junctions.
B) fibrous heart rings.
C) electromagnetic discs.
D) sarcolemma sclerotic plaques.
E) tight junctions.

F) B) and D)
G) B) and E)

Correct Answer

verifed

verified

Energy for contraction of myocardial cells comes primarily from


A) aerobic respiration in the mitochondria.
B) anaerobic respiration in the cytosol.
C) glycolysis in the cytosol.
D) ATP that is stored while the heart is not contracting.
E) creatine phosphate.

F) All of the above
G) A) and E)

Correct Answer

verifed

verified

The long refractory period observed in cardiac muscle


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.

F) A) and B)
G) A) and D)

Correct Answer

verifed

verified

Which of the following is NOT a major opening into the right atrium?


A) pulmonary vein
B) inferior vena cava
C) superior vena cava
D) coronary sinus

E) B) and D)
F) A) and B)

Correct Answer

verifed

verified

Which of the following is NOT an enzyme given to someone experiencing a myocardial infarction to break up blood clots?


A) streptokinase
B) tissue plasminogen activator (t-Pa)
C) nitroglycerin
D) urokinase

E) A) and D)
F) A) and B)

Correct Answer

verifed

verified

Lowered extracellular potassium levels will lower the heart rate because


A) the resting membrane potential is hyperpolarized.
B) ectopic action potentials occur.
C) action potential amplitude declines.
D) more sodium channels open.
E) it blocks calcium channels.

F) C) and D)
G) A) and E)

Correct Answer

verifed

verified

Identify the structures that contribute to the slow onset of contraction and prolonged contraction phase in cardiac muscle tissue.


A) Desmosomes
B) Gap junctions
C) Intercalated discs
D) T-tubules
E) Terminal cisternae

F) A) and E)
G) A) and D)

Correct Answer

verifed

verified

Why is it important to use an antibiotic other than ampicillin in the treatment of bacterial pneumonia?


A) Because antibiotics, such as ampicillin destroy the cell walls of cardiac muscle cells.
B) Because antibiotics, such as ampicillin cause the cells lining blood vessels to endocytose bacteria and deposit them in cardiac muscle tissue.
C) Because antibiotics, such as ampicillin are not effective in the treatment of bacterial pneumonia.
D) Because antibiotics, such as ampicillin destroy the cell walls of bacteria which cause a toxin to be released that will destroy cardiac muscle cells.

E) A) and B)
F) All of the above

Correct Answer

verifed

verified

Of the types of damage resulting from a myocardial infarction, which is most likely to cause the greatest increase in the Q-T interval?


A) infarction in the AV node
B) left bundle branch block
C) infarction affecting the SA node
D) tachycardia
E) ectopic focus

F) B) and E)
G) All of the above

Correct Answer

verifed

verified

Depolarization of a cardiac muscle cell occurs as the result of


A) a decrease in the permeability of the cell membrane to sodium.
B) the opening of voltage-gated sodium channels and voltage-gated calcium channels.
C) the closure of voltage-gated calcium channels.
D) the opening of voltage-gated potassium channels.
E) the closure of the voltage-gated sodium channels.

F) A) and B)
G) B) and C)

Correct Answer

verifed

verified

Which of the following statements regarding intrinsic regulation of the heart is true?


A) Stretching the SA node will decrease generation of action potentials in the node.
B) Decreased venous return increases cardiac output.
C) The heart's pumping effectiveness is greatly influenced by small changes in afterload.
D) If cardiac muscle fibers are slightly stretched, they have a stronger contraction force.
E) If cardiac muscle fibers are slightly stretched, they have a weaker contraction force.

F) B) and D)
G) C) and E)

Correct Answer

verifed

verified

Which of the following might increase the risk for cardiovascular disease?


A) stopping smoking
B) exercise
C) maintaining normal cholesterol levels
D) chronic stress
E) lots of fiber in the diet

F) A) and B)
G) A) and E)

Correct Answer

verifed

verified

The valve located between the right ventricle and the pulmonary trunk is the


A) aortic semilunar valve.
B) pulmonary semilunar valve.
C) tricuspid valve.
D) mitral valve.
E) bicuspid valve.

F) D) and E)
G) B) and E)

Correct Answer

verifed

verified

Which vessels empty blood into the left atrium?


A) aorta
B) right atrium
C) pulmonary trunk
D) pulmonary arteries
E) pulmonary veins

F) D) and E)
G) A) and B)

Correct Answer

verifed

verified

Blood in the pulmonary veins returns to the


A) right atrium.
B) left atrium.
C) right ventricle.
D) left ventricle.
E) coronary sinus.

F) A) and C)
G) None of the above

Correct Answer

verifed

verified

The adult heart averages ___________ grams.


A) 100-200
B) 50-100
C) 250-300
D) 400-500

E) B) and D)
F) C) and D)

Correct Answer

verifed

verified

Showing 81 - 100 of 139

Related Exams

Show Answer