1: Cardiovascular Control System

Question 1

What are the most important cardiovascular afferents?

Answer 1

Mechanoreceptors

Question 2

What kinds of receptors are located in the carotid sinus and aortic arch?

Answer 2

• Systemic arterial baroreceptors

- Chemoreceptors

Question 3

Pressure < ___mmHg and > ___ mmHg will have no effect on carotid baroreceptor firing

Answer 3

< 30-50

> 150-180

Question 4

NO and prostacyclin inc/dec systemic arterial baroreceptor sensitivity

Answer 4

Increase

Question 5

Cardiac receptors are sensitive to filling of ____

Answer 5

Atrial chambers (myelinated) all 4 cardiac chambers (unmyelinated)

Question 6

Where are cardiac receptors located?

Answer 6

• Subendocardial tissue

- Veno atrial junctions

Question 7

Increased discharge of chemoreceptors results in inc/dec sympathetic drive to the heart and vessels

Answer 7

Increased

Question 8

Response to PaO2 is most important for peripheral/central chemoreceptors

Answer 8

Peripheral

Question 9

Which part of the brainstem is responsible for reflex control of cardiac activity

Answer 9

Ventrolateral medulla (rostral and caudal)

Question 10

What is the function of the Nucleus Tractus Solitarius?

Answer 10

Common site of synapse for baroreceptors, cardiac receptors, respiratory receptors, CN IX and X

Question 11

What is the purpose of the caudal ventrolateral medulla?

Answer 11

Inhibit tonic and reflex activity of RVLM