Cardiovascularity Flashcards

1
Q
  • Why does acetylcholine decrease blood pressure?
A

(Sets free Nitric Acid and inhibits cardiac activity)

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2
Q
  • What is the effect of compressing both left and right vagus nerve?
A

(respiration stops, then deeper and less frequent, heart rate increase)

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3
Q
  • Which vasomotor centre shows spontaneous activity?
A

(Pressor area)

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4
Q
  • What is the role of apneustic center?
A

(Inspiration)

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5
Q
  • Where can you find the respiratory center/neorons?
A

(Brain stem, pons close to vasomotor center in reticular formation)

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6
Q
  • Which part do you have to stimulate of depressor
A

nerve to cause vasoconstriction?

craniolateral pressor area

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7
Q
  • Which part do you have to stimulate of depressor nerve to cause vasodilatation?
A

(caudomedial depressor area)

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8
Q
  • What nerve has the afferent fibers from baroreceptor in the carotid sinus?
A

(Hering’s nerve)

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9
Q
  • Where are chemoreceptors located in the CNS?
A

(bottom of 4th chamber)

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10
Q
  • Which nerve is efferent for the heart?
A

(n. vagus)

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11
Q
  • Where are volume receptors found?
A

(in the lungs and in the capacitance system of circulation eg. Right atrial wall)

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12
Q
  • What effect does Acetylcholine have on blood pressure?
A

(decrease blood pressure, because it sets free Nitric Acid and inhibits cardiac activity)

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13
Q
  • Which nerve transmits signals from depressor area to heart?
A

(vagus nerve)

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14
Q
  • Where are baroreceptors found?
A

(aortic arch and carotic sinus)

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15
Q
  • Afferent nerve of Hering-Breuer reflex?
A

(vagus nerve)

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16
Q
  • Where are expiratory neurons located in brainstem?
A

(ventral respiratory group)

17
Q
  • Which stump of the depressor nerve do you stimulate to decrease blood pressure?
A

(vagus nerve)

18
Q
  • Where are vasomotor centres located in the brain?
A

(close to respiratory centre in the reticular formation)

19
Q
  • Which area of the brain show spontaneous sympathetic activity?
A

(the pressor area)

20
Q
  • What effect does short term stimulation of the vagus nerve have on blood pressure?
A

(heart rate decrease, blood pressure decrease for a while)

21
Q
  • Name the respiratory centres in the brainstem?
A

(dorsal and ventral respiratory groups)

22
Q
  • What happens if you compress carotid artery caudal to carotid sinus?
A

(slow increase of systemic blood pressure)

23
Q
  • What causes vagus apnoe?
A

(stimulating vagus, due to hering-breuer reflex)

24
Q
  • Which receptors do epinephrine effect?
A

(beta 2 adrenergic receptors, and alpha 1 as well)

25
Q
  • The 2 centers in the pons?
A

(pneumotaxic and apneustic)

26
Q
  • What happens if you compress carotid artery cranial to carotid sinus?
A

(Increase blood pressure)

27
Q
  • Which afferent nerve transfers stimuli from n. vagus to bronchopulmonary centre
A

(expiratory neurons of pons respiratory group)

28
Q
  • What happen to respiration when stimuli of n. vagus?
A

(Irregular respiration)

29
Q
  • EDRF?
A

(Endothelium derived reflex factor)

30
Q
  • EDCF?
A

(Endothelium derived contractile factor)

31
Q
  • What does short time intrinsic control depend on?
A

(myogenic control of diameter of arterioles and metarterioles)

32
Q
  • Location and function of n. phrenicus?
A

(C4 segment, function is modulated by inspiratory neurons)

33
Q
  • What is vasomotor center?
A

(centers in the brainstem responsible for circulation)