ANSC 3080 Lecture Notes - Lecture 8: Vascular Resistance, Cardiac Muscle, Afterload
18 Oct 2016
School
Department
Course
Professor
Document Summary
Heart as a pump, blood vessels and blood pressure. Describe determinants of cardiac performance, blood flow, and blood pressure. Describe pressure changes in the systemic circulation during a cardiac cycle. Role of baroreceptor reflexes in controlling blood pressure. Aortic valve opens during ventricular contraction rapid flow of blood increased arterial pressure. Aorta elasticity absorbs some of the pressure. Temporarily stores energy like a rubber elastic. Energy stored during the stretching of the aorta released. Allows blood flow to continue in vessels. Volume of blood ejected per contraction = end-diastolic volume (edv) end-systolic volume (esv) Volume of blood present in the ventricles at the end of diastole. Work imposed on ventricles prior to contraction. Esv = afterload residual volume of blood contained in ventricle after systole impedance to ejection of blood from ventricles. Increase in edv = increase in stroke volume. Alters cardiac performance via the frank starling law of the heart.
