vessel anatomy - heximer Flashcards
what controls blood going into caps.
pre-capillary sphincter
what is blood volume distributions in body
large art - 15-20%
small arteriole -3%
veins - 65-70%
what are 2 most important properties of veins
- compliance
2. resistance
what is compliance
V/P
what determines resitance
poiseuilles law
what part of venous system has most area
caps.
where is blood velocity the slowest
caps.
what are 2 main types of caps. and where are they
- tight - most of body
2. fenestrated - liver etc. - let more out
what determines net pressure flow out of caps
hydrostatic pressure and osmotic pressure
what is muscle in art and vein
smooth muslce
what is diff between striate and smooth muscle in structure
striated - organized
smooth - no ultrastructure
what is diff between striate and smooth muscle in activation
striated - direct Ca activation
smooth - Ca activation via enzyme cascade
what is diff between striate and smooth muscle in activation on/off
striated - on off mech
smooth - graded actitvity
what is diff between striate and smooth muscle in E requirement
striated - high
smooth - low
what is diff between striate and smooth muscle in contracted length
striated - 4/5
smooth - 1/5
