L12-Control of blood pressure

Question 1

Where is afferent activity from the baroreceptors carried to?

Answer 1

The nucleus tractus solitarius

Question 2

Where is the strongest baroreceptor reflex action on blood vessels?

Answer 2

Strongest in the GIT

Question 3

What is functional importance of the baroreceptor reflex?

Answer 3

It tonically keeps ABP down and continuously buffers changes in blood pressure

Question 4

What are typical values for SV and EDV?

Answer 4

SV=70

EDV=130

Question 5

What is the equation for ejection fraction?

Answer 5

SV/EDVx100

Question 6

What is the main cause of reduced ejection fraction in heart failure?

Answer 6

The heart has reduced inotropy (contractility) due to either signal transducing problems or a loss of contractable muscle. This means sympathetic innervation and other inotropes cannot increase heart contractility.

Question 7

What does laplaces law state about dilated hearts?

Answer 7

According to Laplace’s law, a dilated heart (one with a larger radius) will have to generate a greater wall tension in order to raise pressure inside the ventricle the same amount as a healthy ventricle.