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Flashcards in Extrinsic Regulation Deck (11)
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1
Q

Neural control facts

Innervation

SNS/PNS transmitters

Receptor for NE

A

Majority of BV receive SNS but not PNS (do= Salivary glands/ GI glands/ erectile tissues

S- NE
P- Ach

Alpha adrenergic in SM

2
Q

Characteristics of SNS control of BV

Terminal arterioles

A

Symp activity serves systemic needs

Terminal arterioles- local/individual tissue control

3
Q

Symp vasoconstrictor tone

Vasomotor tone

A

VC area transmits signals continuously to SNS fibers

Slow firing of these fibers (symp vasoconstrictor tone)

Maintains a partial state of contraction

4
Q

Rapidity of nervous control of arterial pressure

A

within seconds- extremely rapid

5
Q

SNS regulates contractile state of resistance/capacitance vessels

Supply?

Constrict resistance
Capacitance

More responsive

A

arteries/arterioles/veins

Constricts and inc periph resistnace

Inc venous pressure/return

Capacitance- lower stimulation necessary

6
Q

Hormones

A

directly/indirectly effect BF by facilitating VC/VD

7
Q

Epi/Norepi

What?
Where?
What do they do?

AA vs B2A

A

Humoral factors that affect vasc resistance

AM in response to inc symp neural activity

Acts on AA receptors for VC
Acts on B2A for VD

AA outnumbers- VC/resistnace

8
Q

RAAS

AT2 action sites

A

Release hormones
Act on kidney to retain Na
Vasoconstrictor

9
Q

RAAS most powerful vasoconstrictor

Mechanisms
1-4

A

Direct
Potentiate constriction of symp activity by inhibiting NE euptake
Eliciting secretion of endothelin
Release renin, making AT2

10
Q

ADH

Where?

Functions- low/high conc

Stimuli

A

Posterior pituitary
low conc, dec excretion of H2O high conc, vasoconstriction

Osmotic conc of ECF
Decreased blood volume

11
Q

Hierarchy of vascular control

Bottom tier
Middle tier
Top tier

A

B- autoregulation via myogenic

M- autoregulated flow inc/dec via intrinsic mechanisms
VD- functional hyperemia, endothelial secretions, autocoids

T- vasomotor nerves/hormones