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Physiology > Cardiovascular Reflexes > Flashcards

Cardiovascular Reflexes Flashcards

1
Q

In the Vasomotor Center, what nerves are effected by PNS?

A

Vagal-cardiodepressor nerves

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2
Q

How does the PNS effect HR?

A

It decreases it

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3
Q

In the Vasomotor Center, what nerves are effected by SNS?

A

Cardioaccelerator nerves

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4
Q

How does the SNS effect HR?

A

It increases it

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5
Q

True or False? ANS has rapid short term control.

A

True

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6
Q

True or False? SNS is more important for circulation control than PNS.

A

True

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7
Q

True or False? PNS is more influence on cardiac system.

A

True

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8
Q

What are the effector organs of ANS cardiovascular reflexes?

A

cardiac, vascular, and kidneys

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9
Q

The ______ has continuous slow firing to maintain vasomotor tine.

A

SNS Vasconstrictor area

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10
Q

The _____ inhibits vasoconstrictor area.

A

SNS Vasodilator area

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11
Q

What other areas influence vasomotor control?

A 
Hypothalamus
Motor
Frontal and Temporal Cortex
Amygdala 
Cingulate
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12
Q

True or False? PNS affect HR only for practical purposes through Vagus nerve.

A

True

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13
Q

Through what mechanism is heart rate controlled?

A

SA Node

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14
Q

Through what mechanism is heart contractility controlled?

A

Ventricle Contraction

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15
Q

Through what mechanism is vascular resistance controlled?

A

Systemic Arterioles

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16
Q

Through what mechanism is vascular compliance controlled?

A

Systemic Veins

17
Q

Through what mechanism is blood volume controlled?

A

kidneys

18
Q

Chemoreceptors are loactde in the carotid and aortic bodies. They send afferent signals through _____ and _____ nerves..

A

Vagus and Glossopharyngeal

19
Q

What are the four stimuli for chemoreceptors?

A
  • hypoxemia: decrease in PaO2
  • hypercapnia: increase in PaCO2
  • acidosis: decrease in pH
20
Q

True or False? Chemoreceptors have the same pathway as baroreceptors, but not as potent.

A

True

21
Q

What happens when you have a decrease in blood flow to vasomotor center (CNS Ischemic Response)?

A

CNS hypercapnia

Rapid activation of SNS vasoconstrictor system

22
Q

How does body respond to hypotension?

A
  • decrease in afferent impulses via vagus and glossopharyngeal nerves in medulla, increase SNS efferent
  • arterial constriction, increasing TPR
  • vein vasoconstriction, increasing BV
  • increase HR, increasing strength of contractility
  • fluid retention by renal system
  • increase respiratory rate
23
Q

How does body respond to postural change?

A
  • decrease in preload, decreasing BP

- increase SNS, decrease in PNS, vasconstriction

24
Q

____ is failure to respond to postural change.

A

Cardiovascular incompetence

25
Q

_____ causes venous pooling due to medication, pregnancy, ANS dysfunction, prolonged bed rest, cachexia.

A

Orthostatic Hypotension

26
Q

_____ is temporary loss of consciousness.

A

(Vasovagal) Syncope

Physiology (15 decks)

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