PSL301H1 Lecture Notes - Lecture 4: Cardiac Output, Stroke Volume, Cardiac Muscle

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

Document Summary

Esv = end systolic volume (~65 ml) Edv = end diastolic volume (~135 ml) Amount of blood pumped by 1 ventricle in 1 contraction. Cardiac output (ability of the heart to pump blood) Amount of blood pumped /unit time (per ventricle) Preload: the ability to deliver blood to the heart. Afterload: the back side (aortic side)of the hear. = blood pressure, the pressure that the heart needs to fight against in order to deliver blood into the aorta. Inotropy: ability of your muscle to squeeze (contractility) Preload of cardiac muscle cells is the critical factor controlling stroke volume (frank- Heart can pump all the blood that you deliver up till the physiological value. It pumps harder when more blood is delivered. Slow heartbeat and exercise increase venous return to the heart, increasing sv. Blood loss and extremely rapid heartbeat decreased sv. Right: venous : floppy, has huge capacity,