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Central Ischemic ResponseSevere drop in Brain MAP > increase in flow to brain & brain MAP,
shunt blood away from other organs (vasoconstriction via sympathetic)
HOWEVER, long term O2 deprivation shuts down brainstem…lose the integrator
Causes systemic vasodilatation and further drop in MAP…… DEATH!
Lose systemic sympatheticResults in severe vasodilation
HR and contractility DROPReduced Cardiac Output
MAP = CO x R
Capillary Anatomy
Continuous Capillaries Fenestrated Capillaries
Transcytosis via vesicles
Large Proteins & Solutes
Diffusion directly through capillary wall
O2 & CO2, Ions
Movement through capillary walls
Capillary Hydrostatic Pressure (CHP)
Colloid Osmotic Pressure (COP)
Fluid Movement = CHP - COP
Fluid Moves out to ISF
FILTRATIONFILTRATION
Fluid Moves in to Capillary
ABSORPTIONABSORPTION
BLOOD FLOWArterial side Venous side
Filtration drives Fluid into ISF
O2, Ions, Nutrients, Glucose!
Absorption drives Fluid into Capillary
CO2, Metabolic wastes,recycled molecules
COP > CHP
CHP
COP
COP > CHP
Arterial side Venous side