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vessel flow
| Term | Definition |
|---|---|
| net filtration formula | net hydrostatic pressure - net oncotic pressure |
| positive net filtration | fluid out capillary at arterial end |
| negative net filtration | fluid in capillary at venule |
| reabsorption | fluid to capillary from interstitium @ venule |
| filtration | fluid to interstitium from vessel @ arteriole |
| interstitial space | btwn capillary and tissue |
| osmotic pressure | think solute (PULL) |
| blood hydrostatic pressure | force exerted by fluid inside capillaries (PUSH) think BP |
| capillary exchange | two-way movement of fluid |
| hormonal control | vasoconstrictors increase BP volume retention increases BP volume reducer decreases BP |
| vasoconstrictors | angiotensin II, epi/epinephrine |
| volume retention | aldosterone, antidiuretic hormone |
| volume reducer | NAP |
| PNS activity on cardiac system | lower HR= Lower SV vasodilation of blood vessels decreased cardiac output & decreased BP |
| SNS activity on cardiac system | ^ HR ^ SV vasoconstriction of blood vessels ^ cardiac output ^BP |
| neural control | cardiocenters in medulla oblongata baroreceptors (STRETCH) chemoreceptors (pH, Oxygen, CO2) ^BP= ^action potentials lower BP= lower action potentials |
| baroreceptors and chemoreceptors located where | Aortic and carotid sinus |
| local control | autoregulation- Flow controlled by the tissue itself |
| vasoreflexes | powerful ways of regulating BP & flow controlled by local, neural, & hormonal mechanisms |
| what causes vasoreflexes | vasoconstriction and vasodilation |
| vessel radius/diameter | ^diameter, decrease BP, ^flow decrease diameter, ^BP, decrease flow |
| what arteries have the most control over vessel radius | arterioles and muscular |
| vessel length | ^length, ^ BP, decrease flow decrease length, decrease BP, ^ flow |
| viscosity | thickness of blood influenced by RBC & albumin protein ^viscosity, ^BP, decrease flow decrease viscosity, decrease BP, ^flow |
| hypervolemic | high blood volume |
| hypovolemic | low blood volume |
| blood volume | amount of blood in vessels ^volume ^flow ^BP decrease volume, decrease flow, decrease BP |
| compliance | ability to stretch and recoil ^compliance accommodates change in flow w/o change in BP |
| cardiac output by flow and BP | ^CO, ^flow, ^BP decrease CO, decrease flow, decrease BP |
| variables that influence blood flow and BP | CO, compliance, blood volume, viscosity, vessel length, vessel radius |
| pulse | measurement of arterial stretch and recoil per BPM strength indicates estimate in change of systolic pressure |
| perfusion | flow per given volume |
| mean arterial pressure | an average BP & tells us about blood delivery to organs |
| high pulse pressure | wide |
| low pulse pressure | narrow |
| pulse pressure | systolic pressure - diastolic pressure can indicate early dysfunction |
| hypotension | decreased BP >90/60mmHg |
| hypertension | increased BP <130/80mmHg |
| which is systolic in 120/80mmHg | 120 (first sound) |
| which is diastolic in 125/75mmHg | 75 (last sound) |
| Blood pressure | measurement of force against walls of vessels or chambers in systemic arteries unless specified. usually taken on brachial artery |
| resistance | slowing or blocking of flow vessel diameter, vessel length, blood viscosity |
| flow | movement of blood to tissue, organ, & vessel |
Created by:
huntybaby