Chapter 20 Slides 38+ Flashcards
________ _______ picks up excess fluid not reabsorbed at the capillary, filters fluid and returns it to venous circulation
lymphatic system
local blood flow is dependent upon what four variables?
1) degree of tissue vascularity
2) myogenic response
3) local regulatory factors altering blood flow
4) total blood flow
extent of vessels in tissue
vascularity degree of vascular ization
metabolically active tissues have high_________
vascularity
areas that have a high degree of vascularization
brain, skeletal muscle, heart, liver,
structures that have little vascularity or are avascular?
tendons, ligaments, epithelia, cartilage, cornea, lens of eye
_______ _______: smooth muscle in blood vessel wall keeps local flow relatively constant
myogenic response
if systemic blood pressure Rises the arterial will stretch, due to myogenic response smooth muscle of arterial wall or respond by?
contracting
contractional return local flow to original levels
if systemic blood pressure decreases and the amount of blood decreases there will be less stretch, in response to decreased stretch due to myogenic response smooth muscle will?
relaxes, relaxation will return local blood flow to original levels
vasoactive chemicals alter?
blood flow
___________ dilate arterioles and relax precapillary sphincters, increase flow into capillary beds.
vasodilators
_________ constrict arterioles and cause contraction of precapillary sphincters decreasing flow into capillary beds
vasoconstrictors
___________ and changing metabolic activity: process by which tissue controls local blood flow. when tissue activity increases, stimuli signal inadequate perfusion
autoregulation
oxygen and nutrient decline, and carbon dioxide, lactic acid, hydrogen and potassium increase will stimulate ____________ through autoregulation
vasodilators
in autoregulation as perfusion increases vessels ___________ in response
constrict, negative feedback
autoregulation in changing metabolic activity.___________ increase in blood flow after it is temporarily disrupted.functioning to restore required oxygen nutrients and eliminate waste
reactive hyperemia