# Circulation Quiz 4

 Basic property of VEINS balloon-like, have much lower pressure (than arteries) they are main STORAGE of blood blood distribution - 64% in veins Basic property of CAPILLARIES Tissue EXCHANGE How is blood exchanged at capillaries?  (what controls movement in/out of capillary) DIFFUSION. What solutes can NOT diffuse via capillaries? RBCWBCPlatelets Proteins *Result is that blood mirrors solute environment (except for proteins) Basic property of ARTERIES PRESSURE. they are elastic Basic property of ARTERIOLES distribution How to change blood vessel flow? (equation) Q= ΔP / R ΔP -- change of pressureR --- resistanceQ-- flow (at a given time) What direction does pressure go?  WHat does it depend on? ALWAYS from GREATER to a LOWER pressure! Depends on: 1. blood volume 2. size of vessel (structure & tone) *originates from the heart, pressure drops along the way. What changes resistance most? the change in SIZE of the blood vessel (just a small adjustment to radius will increase flow) IN TERMS OF SOLUTE CONCENTRATION Arteries reflect what part of the body? Veins reflect what? arteries reflect LUNGS arteries=away from the heart vein reflect TISSUESveins=towards the heart Describe the two forces of pressure in "Colloid Osmotic Pressure" In vessel: the plasma contains many proteins (b/c they can't escape), thus makes plasma hypertonic.  THis attracts WATER and PULLS IN.  (H20 moves from HYPO TO HYPER regions).  The blood pressure pushes back, PUSHING OUT. *this does not effect sugar or oxygen levels-- NO EFFECT ON COMPOSITION, just effects fluid distribution So if BP is higher than COP, then fluid is.... If BP is same at COP.... If COP is higher than BP.... leaking out of vessel (edema) equilibrium fluid is oozing in What does lymphatic capillaries do? returns excess fluid to circulation What are baroreceptors? sensors located in the blood vessels.  neurons that become that is excited by stretch of the blood vessel. Thus, increases in the pressure of blood vessel triggers increased action potentials and provides information to the central nervous system. This sensory information is used primarily in autonomic reflexes that in turn influence the heart cardiac output and vascular smooth muscle to influence total peripheral resistance Hypotension will cause increase in _________ stimulation Hypertension will cause decrease in _________ stimulation low BP = increased sympathetic system! high BP = decreased sympathetic system! kidney's act as a drain, they magically turn blood into urine! High BP = more _____  than _____ Low BP= less _____ High BP = More PLASMA THAN URINELow BP= less urine Low BP= Less urine..... then what gets released? RENIN Renin is an angiotensin, which causes vasoconstriction (subsequently increases blood pressure b/c constricted vessels increases resistence of blood flow).Renin also causes kidneys to retain salt & water (directly via aldosterone) OVERVIEW ΔPressure is controlled by: barorecptorscapillary exchangekidneys OVERVIEW Resistance is controlled by: the tissues according to need, nerve overrideie vasoconstriction (esp arterioles) OVERVIEW What is the formula for determining blood flow? Q= Δ P_       R Authorsurprise ID268409 Card SetCirculation Quiz 4 Descriptioncirculation quiz Updated2014-04-02T02:00:41Z Show Answers