PSL301H1 Lecture Notes - Lecture 11: Sinoatrial Node, Parasympathetic Nervous System, Renin

• School: UTSG
• Department: Physiology
• Course: PSL301H1
• Professor: Michelle French

Document Summary

We move around 5l of blood per minute cardiac output. Variables that affect venous return and end diastolic volume. Any change at one level has direct consequences at other levels. Blood flow through individual blood vessels is determined by vessels resistant to flow. In a closed system, the total volume of input flow equals the total volume of the output flow. In the circularity system, blood is being carried to different organs such as liver and kidneys and they are not all carried by the same size vessels; some maybe under sympathetic nervous stimulation. When one vessel is constricted, resistance increases and blood flow decreases. Flow from the constricted vessel is redirected to other vessels with lower resistance. Pressure effects can occur in arterioles, capillaries and veins. Blood pressure is the highest in the arteries and decrease continuously as it flow through the circulatory system. Left ventricle contracts, generates pulse; great fluctuation in pressure.