Baroreceptors and chemoreceptors

Question 1

Receptors:

Answer 1

Aortic arch and carotid sinus

Question 2

Receptor:

aortic arch

Answer 2

Aortic arch via vagus nerve to solitary nucleus of medulla -Responds only to INCREASED BP

Question 3

Receptor:

carotid sinus

Answer 3

Carotid sinus transmits via glossopharyngeal nerve to solitary nucleus of medulla
- Responds to both increase and decrease in BP

Question 4

Baroreceptors contribute to

Answer 4

1) hypotension
2) carotid massages
3) cushing reaction

Question 5

Baroreceptor to hypotension

Answer 5

Low arterial pressure,
low stretch
low afferent baroreceptor firing
high efferent sympathetic firing
low efferent parasym stimulation

Vasoconstriction, high HR, high contractility, high BP
Most important in severe hemorrhage

Question 6

Baroreceptor to carotid mssage

Answer 6

High pressure on carotid artery
high stretch
high afferent baroreceptor firing
low HR

Question 7

Baroreceptor to cushing reactin

Answer 7

Triad of hypotension, bradycardia, respiratory depression
High ICP constricts arterioles
Cerebral ischemia
Reflex sympathetic increase in perfusion pressure
High stretch
Reflex baroreceptor induced-bradycardia

Question 8

Chemoreceptors: peripheral

Answer 8

Peripheral:
carotid and aortic bodies are stimulated by low PO2 (<60),
high PCO2, and low pH blood

Question 9

Chemoreceptor: central

Answer 9

Stimulated by changes in pH and PCO2 of brain interstitial fluid, which in turn are influenced by arterial CO2

Do not directly respond to PO2.