Integrated Neurohumoral CV control

Question 1

Arterial bp equation

Answer 1

BP = CO x TPR, cardiac output x total peripheral resistance

Question 2

CO =

Answer 2

SV x HR

Question 3

What’s the bainbridge reflex

Answer 3

Where if your HR is too low, increasing SV will increase it not decrease it

Question 4

Where in the brain do the baroreceptors fire

Answer 4

Nucleus Tractus solitarus of the medulla

Question 5

What are the steps of RAAS activation

Answer 5

• 1 Renin released by juxtaglomerular cells
  
  • 2 Angiotensinogen is cleaves
  • 3 angiotensin 1 travels to lungs
  • ACE produces angiotensin II
  • Aldosterone released from adrenal cortex

Question 6

• 3 triggers of RAAS activation

Answer 6

• Low renal artery pressure
  
  • Sympathetic stimulation of juxtaglomerular cells
  • Decreased Na+ content in ultra filtrate in kidney

Question 7

Sympathetic action on heart (NT, receptor, effect)

Answer 7

NE, Beta 1, increased chronotropy, inotropy, and dromotropy

Question 8

Sympathetic action on vasculature (NT, receptor, effect)

Answer 8

NE, alpha 1, constriction (increased resistance, decreased capacitance)

Question 9

Parasympathetic action on heart (NT, receptor, effect)

Answer 9

Ach, M2, decreased chronotropy, dromotropy

Question 10

Parasympathetic action on vasculature

Answer 10

Negligible