Blood Flow Regulation

Question 1

The _______ Nervous System ultimately governs the heart and systemic circulation.

Answer 1

Auntonomic

Question 2

Sypathetic nervous system is _______ of cardiac activity.

Answer 2

Activation

Question 3

Sypathetetic Nervous System effect

Answer 3

1.Drives the HR, SV, and Blood
-releases NOREPI at sypathetetic nerve endings which activate B1 heart recepetors.
-This INCREASES cardiac activiity
-Norpi activates A1 arterial receptors, which increases vasoconstriction, BP, and blood flow.

Question 4

Parasympathetic Nervous System effect

Answer 4

1. Counters the SNS activity via the vagus nerve
   -Acetycholine (Ach) activation of cholinergic receptors downregulates cardiac function and increases arterial vasodialation

Question 5

The Parasympathetic nervous system is ______ cardiac activity.

Answer 5

slowing/relaxing

Question 6

Feedback from _____ and _____ in response to localized metabolite accumulation and stress on vessel wall will elicit an appropriate SNS or PSNS response.

Answer 6

Baroreceptors and chemoreceptors

Question 7

At rest what does the SNS and PSNS relationship look like?

Answer 7

there is always a balance between the two at rest

Question 8

During exercise and activity which system dominates?

Answer 8

SNS system. SNS=activation

Question 9

what are three other unique regulators of blood flow?

Answer 9

-muscle pump
-respitory pump
-Exercise pressor reflex

Question 10

Muscle Pump

Answer 10

-muscle contraction compresses local veins.
-one way valves prevent venous blood from flowing backwards so blood is pushed back to the heart!!

Question 11

What part of the body is the muscle pump useful for?

Answer 11

lower extremintes

Question 12

Respitory pump

Answer 12

-expansion of thoracic cavity decreases pressure of thoracic cavity which creates suction which facilitates venous blood return back up to heart

Question 13

Exercise pressure reflex

Answer 13

-activation of skeleletal muslce when we exercise causes a reflexisive repsonse in cardiac system to increase BP, HR, and Q.
-Stimulates vasocontriction in less active tissues to redirect blood to working muscles
*ensures adequate blood delievery and venous return to heart

Question 14

Vaso/vasal response

Answer 14

-thought or aticitaion of activity casuses BP to drop
(like before a race)

-or thought of blood leaving body (like blood draw) casues BP to drop and awareness drop too