A) ventricular systole
B) ventricular diastole
C) ventricular filling
D) atrial systole
E) the P wave of the ECG
Correct Answer
verified
Multiple Choice
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.
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verified
Multiple Choice
A) angioplasty.
B) coronary bypass.
C) urokinase injection.
D) tissue plasminogen activation.
E) angiogram.
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verified
Multiple Choice
A) fibrous pericardium.
B) parietal pericardium.
C) visceral pericardium.
D) myocardium.
E) epicardium.
Correct Answer
verified
Multiple Choice
A) gap junctions.
B) fibrous heart rings.
C) electromagnetic discs.
D) sarcolemma sclerotic plaques.
E) tight junctions.
Correct Answer
verified
Multiple Choice
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.
Correct Answer
verified
Multiple Choice
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.
Correct Answer
verified
Multiple Choice
A) pulmonary vein
B) inferior vena cava
C) superior vena cava
D) coronary sinus
Correct Answer
verified
Multiple Choice
A) streptokinase
B) tissue plasminogen activator (t-Pa)
C) nitroglycerin
D) urokinase
Correct Answer
verified
Multiple Choice
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.
Correct Answer
verified
Multiple Choice
A) Desmosomes
B) Gap junctions
C) Intercalated discs
D) T-tubules
E) Terminal cisternae
Correct Answer
verified
Multiple Choice
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.
Correct Answer
verified
Multiple Choice
A) infarction in the AV node
B) left bundle branch block
C) infarction affecting the SA node
D) tachycardia
E) ectopic focus
Correct Answer
verified
Multiple Choice
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.
Correct Answer
verified
Multiple Choice
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.
Correct Answer
verified
Multiple Choice
A) stopping smoking
B) exercise
C) maintaining normal cholesterol levels
D) chronic stress
E) lots of fiber in the diet
Correct Answer
verified
Multiple Choice
A) aortic semilunar valve.
B) pulmonary semilunar valve.
C) tricuspid valve.
D) mitral valve.
E) bicuspid valve.
Correct Answer
verified
Multiple Choice
A) aorta
B) right atrium
C) pulmonary trunk
D) pulmonary arteries
E) pulmonary veins
Correct Answer
verified
Multiple Choice
A) right atrium.
B) left atrium.
C) right ventricle.
D) left ventricle.
E) coronary sinus.
Correct Answer
verified
Multiple Choice
A) 100-200
B) 50-100
C) 250-300
D) 400-500
Correct Answer
verified
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