DANCEST 805 Lecture Notes - Lecture 20: Autonomic Nervous System, Smooth Muscle Tissue, Blood Vessel
Document Summary
Cardiovascular system 3 intrinsic and extrinsic control. Anatomy, blood flow, action potentials, muscle contractions. Talking about controlling the flow of blood around the body. When smooth muscle in blood vessels contracts. When smooth muscle in blood vessels relaxes. Smooth muscle responding to stretch, temperature, locally secreted chemicals. Both intrinsic and extrinsic control relates to altering the internal diameter of blood vessels. Major arteries and veins (except aorta) are under extrinsic control. Arterioles and venules are under both extrinsic and intrinsic control. Blood flow is effectively time it takes to get a fixed volume from a to b. Directly after a change in blood pressure. Blood flow changes in the same direction. Done to keep the flow rate constant. The same volume will move at different speeds based upon the size of the gap. Rise in blood pressure causes vessels to stretch. Smaller vessel + increased pressure= same flow rate. Fall in blood pressure causes vessels to relax.
