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Visc Phys > Exam II > Flashcards

Exam II Flashcards

1
Q

Rapid calcium influx occurs during which phase of the rhythmic action?

Phase 0
Phase 1
Phase 2
Phase 3

A

Phase 0

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2
Q

Increase in sodium influx occurs during which phase of myocardial action potential?

Phase 0
Phase 1
Phase 2
Phase 3

A

Phase 0

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3
Q

Increase in calcium for subsequent contraction occurs during which phase of the myocardial action potential?

Phase 0
Phase 1
Phase 2
Phase 3

A

Phase 2

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4
Q

Sympathetic stimulation will cause which of the following?

Decreased stroke volume
Decreased cardiac output
Cutaneous vasoconstriction
Coronary vasodilation

A

Cutaneous vasoconstriction

Coronary vasodilation

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5
Q

Which will not cause sympathetic stimulation?

Systemic vasodilation
Venular vasdilation
Arteriolar vasoconstriction

A

Systemic vasodilation

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6
Q

The rate of impulse generation is fastest in which of the following?

Purkinje system
Bundle of his
AV node
SA node

A

SA node

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7
Q

Speed of conduction of the myocardial action potential is the fastest in which of the following?

Purkinje system
Bundle of his
AV node
SA node

A

Purkinje system

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8
Q

A week ventricular myocardium can result in what?

Decreased stroke volume
Decreased cardiac output
Bradycardia
Tacticardia

A

Decreased stroke volume

Decreased cardiac output

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9
Q

Arteriolar constriction is mediated by vascular receptors?

Muscarinic ACh
Alpha-adrenergic
Beta-adrenergic
Nicotinic

A

Alpha-adrenergic

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10
Q

Which of the following is not a vasoactive substance?

Renin
Epinephrine
Norepinephrine
AG I

A

Renin

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11
Q

Which of the following will not cause arteriolar constriction?

Renin
Epinephrine
AG I
AG II

A

Renin

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12
Q

Which of the following statements is correct regarding venous return?

Exercise will cause venous return to increase
Decreased venous return will decrease stroke volume
Sympathetic stimulation will dilate veins increasing venous return
Valves prevent flow from reaching heart

A

Exercise will cause venous return to increase

Decreased venous return will decrease stroke volume

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13
Q

Sensory signals from baroreceptors in carotid sinus are carried to nucleus of the solitary tract of which of the following fibers?

Descending CN IX
Descending CN X
Ascending CN IX
Ascending CN X

A

Ascending CN IX

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14
Q

Sensory signals from the baroreceptors in the aortic arch are transmitted by parasympathetic fibers of

CN X
CN IX
CN IV
CN IIV

A

CN X

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15
Q

The substance that increases blood volume by retaining sodium from the ECF is which of the following?

Renin
Aldosterone
ADH
Angiotensin converting enzyme

A

Aldosterone

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16
Q

Myocardial contractility depends upon adequate concentration of which of the following cations?

Calcium
Potassium
Sodium
Magnesium

A

Calcium

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17
Q

Rapid repolarization phase of the plateau action potential occurs due to which of the following events?

Sodium ion influx
Sodium ion efflux
Potassium ion influx
Potassium ion efflux

A

Potassium ion efflux

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18
Q

Slow depolarization in cells of the SA node are due to influx of which ions?

Sodium
Potassium
Chloride
Calcium

A

Sodium

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19
Q

A person with hyper-aldosteronism will present with which of the following?

Increased blood volume
Hyperkalemia
Hypokalemia
Hypotension

A

Increased blood volume

Hypokalemia

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20
Q

Which of the following conditions will cause systematic arterial blood pressure to rise?

Hypo-aldosteronism
Excessive plasma ADH
Vagal stimulation
All of the above

A

Excessive plasma ADH

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21
Q

All of the following except ____ will cause systemic blood pressure to rise?

Increased vagal tone
Increased cardiac output
Increased aldosterone
None of the above

A

Increased vagal tone

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22
Q

Which hormone causes only water retention?

ADH
Aldosterone
Angio converting enzyme
Atrial natriuretic peptide

A

ADH

23
Q

Which hormone causes NA+ excretion?

ADH
Aldosterone
Angiotensin converting enzyme
Atrial natriuretic peptide

A

Atrial natriuretic peptide

24
Q

Which is not correct regarding the myocardium?

Muscle contractions are always preceded by muscle action potentials

Both atria contract simultaneously

Ventricular contractions are delayed after atria contract

Hypocalcemia will cause stroke volume to increase

A

Hypocalcemia will cause stroke volume to increase

25
Q

The normal electrical axis of the heart is what?

0
60
120
180

A

60

26
Q

Fastest rate of slow depolarization; normal pacemaker

A

SA node

27
Q

Depolarization due to calcium influx

A

AV node

28
Q

Cells are deficient in gap junctions; relatively thin fibers and fewer gap junctions

A

AV bundle

29
Q

Primer pump; repolarization is not represented in the EKG

A

Atrial myocardium

30
Q

QRS complex of the EKG represents depolarization; contraction determines cardiac output

A

Ventricular myocardium

31
Q

First heart sound occurs

A

Period of isometric contraction

32
Q

Semilunar valves open

A

Period of ejection

33
Q

Dicrotic notch on BP curve

A

Period of isovolmetric relaxation

34
Q

Occurs after the 2nd heart sound

A

Period of passive filling

35
Q

Occurs during PR segment

A

Period of active filling

36
Q

Sympathetic stimulation will cause vasoconstriction in which of the following circulatory beds?

Coronary
Cutaneous
Cerebral
Pulmonary

A

Cutaneous

37
Q

Arteriolar diameter is predominately dependent upon sympathetic tone in which of the following vascular beds?

Coronary
Cutaneous
Cerebral
Pulmonary

A

Cutaneous

38
Q

Stimulation of which of the following will decrease heart rate?

Adrenergic receptors in the SA node
Adrenergic receptors in the myocardium
mACh receptors in SA node

A

mACh receptors in SA

39
Q

Stimulation of which of the following will not increase systemic blood pressure?

Adrenergic receptors in SA node
Adrenergic receptors in myocardium
mACh receptors in SA node
None of the above

A

mACh receptors in SA node

40
Q

The plateau phase of myocardial contractions is which of the following?

ECF
Mitochondria
SR
ER

A

ECF

41
Q

Myocardial tissues function as syncitia because of which structural characteristics?

Branched nature of myocardial fiber
Gap junctions
All of the above
None of the above

A

All of the above

42
Q

Systolic pressure in the pulmonary artery is the same as the systolic pressure in the systematic arteries.

True/False

A

False

43
Q

Mitral valve stenosis will decrease cardiac output.

True/False

A

True

44
Q

Mitral valve prolapse may lead to cardio-acceleration.

True/False

A

True

45
Q

Sympathetic stimulation will decrease cardiac output.

True/False

A

False

46
Q

A person will uncontrolled hypertension may complain of frequent urination.

True/False

A

True

47
Q

Vagal vagal stimulation will cause sinus bradycardia.

True/False

A

True

48
Q

Oncotic pressure draws water from the ISF to the plasma.

True/False

A

True

49
Q

Most of the blood is contained in the veins.

True/False

A

True

50
Q

Blood pressure, EKG, volume in heart chambers, and sounds are monitored during cardiac cycle.

True/False

A

True

51
Q

S1 (lubb) is a result of AV valve closure.

True/False

A

True

52
Q

Period of isovolumetric contraction -> period of ejection -> period of isovolumetric relaxation -> passive ventricular filling -> active ventricular filling

Correct order of events.

True/False

A

True

53
Q

Baroreceptors are located in the aortic arch and in the carotid sinus.

True/False

A

True

54
Q

Sensory signals from baro receptors are transmitted to cardiac center located in the medulla.

True/False

A

True

Visc Phys (4 decks)

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