Cardiac Reflexes Flashcards
CO * TPR =
M.A.P
Long Term
Short Tem
MAP mediators
LT: Blood Volume - Kidney
ST: Baroreflex CO, TPR
BR: Neg feedback loop
Name the control center of the brain responsible for PS, S Control. Name (2) Receptors
Medulla Oblongata
1) Baroreceptors
2) Aortic Volume Receptor
Where are baroreceptors located
Corotid Artery
Aortic Arch
When input from ____, ____ nerves to the CNS decreases it means that _____ has also decreased. Brain says “hmm” and then increases ______ output. _____ output goes down
Cranial N 9, Vagus
M.A.P
Sympathetic
Parasympathetic
*output means AP
With more sympathetic tone on Reflex
HR increase - SA node
Inotropic State (Ventricle)
Vasoconstriction - Increase TPR
Capacitance V. Constrict*
*Veins loose compliance, become stiff, and increase circulating BV
Baroreceptor Graph (Time vs. M.A.P) w/signaling points
What does the graph tell you?
*shows that the higher the MAP, the more signal you medulla will receive
DR
RR
SS
Direct Resp. –> Immediate
Reflex Resp. –>
Steady State. –> After Reflex
guessing
pick DR
Atrial Vol. Receptors: Gimme Types
A) Pressure
B) Strech
When do you get increases in atrial pressure?
After Atrial Depolarization (P-wave) - Contraction
When do you get increases in atrial stretch?
After Atrial Repolarization (begining T-wave) - Relaxation
The more fluid…
higher frequency means..
The more pressure and stretch, meaning more impulses, and output
*impulses are generated at normal levels too
Blood Decrease - (take me through)
Sympathetic Act leads to..
Less - Pressure/Stretch –> Decreased signaling –> release ADH (retain fluid)
Renin Secretion –> angiotenson —> vasoconstriction.
DH - Aldosterone (retain fluid)
Explain:
Brainbridge Reflex
Chemoreceptor Reflex
CNS - Cushing Reflex
BB: increase HR
CR: Increase Resp, Constriction
CUR: Increase TPR
