Lecture 3

Question 1

2 peripheral chemoreceptors

Answer 1

1. carotid body
   - in carotid artery
   - sense O2
   - respiratory response
   * * will block info from aortic
2. aortic body
   - sense CaO2 (content arteriol)
   - cardiac response

Baroreceptors

Question 2

Low o2 from blood loss

• response
• sensed by…

Answer 2

either:
Increase cardiac output
increase ventilation

if not ventilation, only solution to increase CO (increase HR)

Question 3

Peripheral receptors sensitive to…

Answer 3

CO2, O2, and pH

Question 4

Preferred response? heart vs ventilation

Answer 4

Ventilation

carotid body will block stimulus from aortic body

Question 5

Features of CSF

Answer 5

no RBCs
low protein concentration
lots of carbonic anhydrase (converts CO2 to HCO3-)

Question 6

Central Chemoreceptors detects CO2 from

Answer 6

cerebral spinal fluid*
blood
local metabolism

• Co2 stored as bicarbonate releases H+ during reaction
• low prot concentration in CSF = low buffering –> high response