Term
|
Definition
| can withstand temporary reduction in blood flow. EX: digestive organs, kidneys, skin |
|
|
Term
| Blood flow is ____ proportional to vascular resistance |
|
Definition
|
|
Term
|
Definition
| 1/r^4 (double radius-> 16x flow) |
|
|
Term
|
Definition
mean arterial pressure: main driving force producing blood flow.
Diastolic + 1/3 pulse pressure |
|
|
Term
| Local factors influence the resistance of arterioles: |
|
Definition
local metabolic changes and histamine release
Local physical influences (hot/cold, myogenic response to stretch) |
|
|
Term
|
Definition
| Vasopressin; angiotensin II; cold |
|
|
Term
|
Definition
| Histamine release. Histamine is synthesized and stored in WBC |
|
|
Term
|
Definition
| alpha-1 receptors. They are subject to local controls |
|
|
Term
| Vasodilation mediated by: |
|
Definition
| decreasing sympathetic activity |
|
|
Term
| Short term regulation of BP |
|
Definition
| medulla: epi/norepi reinforce sympathetic activity |
|
|
Term
|
Definition
| Hormones: vasopressin and angiotensin are vasoconstrictors |
|
|
Term
|
Definition
larger radii, low resistance, smaller total cross-sectional area, thinner wall, less elastic, less smooth muscle.
Capacitance vessels: bld reservoir |
|
|
Term
|
Definition
| creates a pressure gradient in the chest cavity, drawing fluid toward the heart |
|
|
Term
|
Definition
|
|
Term
|
Definition
| del widespread vasodilation d/t release of vasodilation substances |
|
|
Term
| neurogenic circulatory shock |
|
Definition
| from widespread vasodilation, but not from the release of vdilator substances |
|
|
Term
| Compensatory measures for BP drop: |
|
Definition
baroreceptor ^symp activ and ^ para
fluid shifts in the capillaries and isf to bld plasma
liver, urinary sys, thirst (retain/drink water) |
|
|
