BIOC34H3 Chapter : C34+CV+Dynamics+marking+2007.doc
Document Summary
Hand-in all of the pages associated with the lab. Note that there are 8 activities to be completed. You do not need to hand in the histology review supplement. (5 marks) Obtain a mark out of 45 and then convert it to a mark out of 5. Exponential: in this experiment, a simulated motor changes the diameter of the flow tube. Explain how our blood vessels alter blood flow. Blood vessels can alter blood flow by either constricting (vasoconstriction) or dilating (vasodilation). Rings of smooth muscle around vessels either relax or constrict to cause the vasodilation or vasoconstriction. Noradrenaline released from sympathetic nerves can cause vasoconstriction by acting on alpha adrenoceptors. Adrenaline released from the adrenal gland can cause vasoconstriction or vasodilation by acting on alpha and beta adrenoceptors, respectively. Increases in radius cause blood flow to increase. Increases in viscosity cause blood flow to decrease.
