Cardiovascular Physiology Flashcards Preview

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Flashcards in Cardiovascular Physiology Deck (37):
1

site of highest resistance in the cardiovascular system

arterioles

2

largest total cross-sectional area and surface area

capillaries

3

contain the highest proportion of the blood

veins

4

upstroke current in ventricles is caused by increase in conductance of __

Na

5

upstroke current in sinoatrial node is caused by increase in conductance of __

Ca

6

hormone responsible for contraction alkalosis

angiotensin II

7

where does angiotensin II directly act on the kidney?

Na+-H+ exchange at proximal convoluted tubule

8

True or False: antidiuretic hormone is involved in minute-to-minute regulation of normal blood pressure

false

9

True or False: aortic arch baroreceptors respond to increases and decreases in arterial pressure.

False. Aortic arch baroreceptors only respond to increases in arterial pressure.

10

Coronary circulation: metabolic control or sympathetic control?

Metabolic control: hypoxia, adenosine

11

Cerebral circulation: metabolic control or sympathetic control?

Metabolic control

12

Muscle circulation at rest: metabolic control or sympathetic control?

Sympathetic control
Vasoconstriction: alpha-1
Vasodilation: beta-2

13

Muscle circulation during exercise: metabolic control or sympathetic control?

Metabolic control

14

Skin circulation: metabolic control or sympathetic control?

Sympathetic control

15

Pulmonary circulation: metabolic control or sympathetic control?

Sympathetic control

16

Prolonged QT interval: hypo/hypercalcemia

Hypercalcemia

17

Shortened QT interval: hypo/hypercalcemia

Hypocalcemia

18

Which phase is responsible for setting the heart rate

rate of phase 4 depolarization

19

AV block that causes fainting in patients due to initially suppressed state of Purkinje fibers?

Stokes-Adams syndrome

20

Atrial filling begins at what phase of cardiac cycle?

rapid ventricular ejection

21

Venous pulse curve: a wave

atrial systole

22

Venous pulse curve: c wave

isovolumic contraction

23

Venous pulse curve: v wave

isovolumic relaxation

24

Longest phase of cardiac cycle

reduced ventricular filling (diastasis)

25

Incisura of aortic pressure

isovolumic relaxation

26

vasomotor area of the medulla: excitatory area

lateral portion

27

vasomotor area of the medulla: inhibitory area

medial portion

28

cranial nerve: carotid baroreceptors

CN IX

29

cranial nerve: aortic baroreceptors

CN X

30

Which reflex is associated with increasing the heart rate in response to increased venous return?

Bainbridge reflex

31

True or false: Myogenic theory explains autoregulation and active and reactive hyperemia.

Myogenic theory explains only autoregulation.

32

Most potent vasoconstrictor

vasopressin

33

Circus movements in the ventricles: increased or decreased refractory period?

Decreased refractory period

34

Ventricular volume is lowest in:
A. atrial systole
B. isovolumetric ventricular contraction
C. rapid ventricular ejection
D. reduced ventricular ejection
E. isovolumetric ventricular relaxation
F. rapid ventricular filling
G. reduced ventricular filling

Ventricular volume is lowest in isovolumetric ventricular relaxation

35

Aortic pressure is highest in:
A. atrial systole
B. isovolumetric ventricular contraction
C. rapid ventricular ejection
D. reduced ventricular ejection
E. isovolumetric ventricular relaxation
F. rapid ventricular filling
G. reduced ventricular filling

Aortic pressure is highest in reduced ventricular ejection

36

Mitral valve opens in:
A. atrial systole
B. isovolumetric ventricular contraction
C. rapid ventricular ejection
D. reduced ventricular ejection
E. isovolumetric ventricular relaxation
F. rapid ventricular filling
G. reduced ventricular filling

Mitral valve opens in isovolumetric ventricular relaxation

37

Most ventricular filling occurs during what phase of the cardiac cycle?

Reduced ventricular phase