Heart 2 Flashcards
1) The atria receive blood from all of the following except:
a) pulmonary veins
b) superior vena cava
c) coronary sinus
d) inferior vena cava
e) all of these choices supply blood to the atria
E
2) The thickest wall in the heart due to its increased work load is the:
a) left atrium
b) right ventricle
c) interventricular septum
d) left ventricle
e) right atrium
D
3) The term used to describe a backflow of blood from the left ventricle into the left atrium is:
a) aortic stenosis
b) mitral valve insufficiency
c) semilunar valve prolapse
d) mitral valve stenosis
e) aortic insufficiency
B
4) Which vessel does not supply the myocardium with blood?
a) coronary sinus
b) left coronary artery
c) circumflex branch
d) marginal branch
e) posterior interventricular branch
A
5) When comparing cardiac muscle tissue to skeletal muscle tissue, which statement is true?
a) both cardiac and skeletal muscle fibers are voluntary
b) skeletal muscle fibers are connected by intercalated discs
c) both types of fibers are striated
d) skeletal muscle fibers are shorter
e) there are more mitochondria in skeletal muscle fibers
C
6) True/False. The prolonged plateau phase of an action potential in a ventricular contractile fiber increases the length of the refractory period, this extended refractory period help to prevent tetanus.
True
7) Which wave is matched correctly with the heart’s activity?
a) QRS complex – atrial repolarization
b) P wave – ventricular repolarization
c) T wave – ventricular depolarization
d) S-T segment – the ventricles are depolarized
D
8) What is occurring during isovolumetric contraction?
a) the amount of blood in each atria is the same
b) the semilunar valves are open and the AV valves are closed
c) the point at which all blood has been ejected from the ventricles
d) all four valves are closed
e) both atria are ejecting blood at the same time
D
9) Which statement is not true regarding heart sounds?
a) S1 is considered the first heart sound
b) S2 is considered the third heart sound
c) S1 is caused by closing of the AV valves
d) S2 is caused by the closing of the semilunar valves
B
10) The amount of blood ejected from either ventricle every minute is called:
a) stroke volume
b) end-diastolic volume
c) afterload
d) cardiac output
e) heart rate
D
11) The Frank-Starling law of the heart states:
a) the lower the preload on the heart the greater the force of contraction
b) the faster the heart rate the greater the volume of blood pumped
c) the greater the afterload the lower the pressure that must be overcome
d) the more the heart is stretched pre-contraction the stronger the force of contraction
e) the greater the stroke volume the greater the heart rate
D
