Lecture 8- The vascular system Flashcards
Arterioles have smooth muscle cells that can… or..
vasodilate
vasoconstrict
What regulates the smooth muscles to constrict or relax?
local controls
extrinsic controls
2 organs that have local control
heart and brain
(also WORKING skeletal muscle)
(the rest are extrinsic control)
Local control when there is a change in metabolic activity is also called …. and the 4 steps to this that cause vasodilation are…
active hyperemia
- increase metabolic activity
- decrease O2, increase metabolites in organ interstitial fluid
- arteriolar dilation in organ
- increase blood flow to organ
The 4 steps active hyperemia that cause vasoconstriction
- decrease metabolite activity
- increase O2, decrease metabolites
- arteriolar constriction in organ
- decrease lood flow to organ
The 4 steps of flow auto regulation that results in vasodilation
- decrease MAP
- Decrease blood flow to organ
- increase metabolites, decrease O2 and vessel-wall stretch
- arteriolar vasodilation/ restore normal flow
The 4 steps of flow auto regulation that cause vasoconstriction
- increase MAP
- increase blood flow to organ
- increase O2, decrease metabolites, increase vessel wall stretch
- vasoconstriction
active hyperemia is when theres a change in …. and flow autoreglation is when theres no change in…
metabolic activity
sympathetic stimulation of alpha-adrenergic receptors causes …
vasocontriction to reduce blood flow
capillary walls are a …. cell in thickness
single endothelial
The capillary is the primary point exchange between the blood and the …
… assist in exchange
interstitial fluid
intercellular clefts
… is movement of fluid and solutes out of the blood
filtration
…. is movement of fluid and solutes into the blood
absorption
2 factors that determine fluid movement across capillaries
hydrostatic pressure
oncotic pressure
hydrostatic pressure will favor… and oncotic pressure will favor…
filtration (movement out of capillary)
absorption (movement into capillary)