Kinesiology 4432A/B Study Guide - Midterm Guide: Smooth Muscle Tissue, Myogenic Mechanism, Vasomotor

• School: Western University
• Department: Kinesiology
• Course: Kinesiology 4432A/B
• Professor: Kevin Shoemaker

Document Summary

For the pressure gradient, it is not metabolic or neural; the muscle pump and perfusion pressure are manipulated. Not many things affect the pressure gradient while, there are. There are alphanergic (vasoconstriction) and betanergic (vasodilation) receptors and depending on what the sns stimulates, there are 2 different responses. Chemo-reflex (responds to the chemicals in the blood of the muscle. Central command signals coming from the brain down. All the signals coming into the brainstem are summed in cns and then sns activates the receptors that could either lead to vasodilation or vasoconstriction. The muscle also releases the metabolic stimuli (co2, adenosine, phosphate) they all affect vasomotor control. Muscle pump: mechanically changing the pressure gradient across the capillary bed (arterioles and veins) Myogenic: mechanically changing the transmural pressure across the vessel wall. This mechanism involves creating a vacuum; every time you contract your muscles, you are increasing the pressure gradient between the arterial and venous side.