Baroreceptor reflex in MAP regulation

Question 1

The firing rate of systemic arterial baroreceptors _______________ when arterial pressure falls.

Answer 1

decreases

Question 2

If systemic arterial pressure increases, parasympathetic activity to the SA node _____________ and HR __________.

Answer 2

increases, decreases

Question 3

In response to an increase in systemic arterial pressure, sympathetic outflow to the heart and vessels _________.

Answer 3

decreases

Question 4

The five important actions of sympathetic action on the heart and tissues when MAP falls are to: __________, __________,__________,__________ and __________.

Answer 4

increase HR, increase contractility, increase TPR, increase venomotor tone, and initiate an increased BV though this requires a long time to become apparent

Question 5

True or false: If the parasympathetic response pathway were blocked by atropine, an increase in MAP would result in no change in HR.

Answer 5

False, HR would still decrease due to the removal of sympathetic tone in response to increasing BR discharge.