APA 2312 Lecture Notes - Lecture 11: Afterload, Insulin, Aorta
4 Apr 2016
School
Department
Course
Professor
Document Summary
If sa node is defecive, av node will take over, and the hr will decrease. Conducion begins with sa node atria . It cannot skip from atria to ventricles, because we have a ibrous skeleton. Systole & diastole typically talking about ventricles. Atrial systole short, compared to rest of the ime the atria contracts. Venous return to heart (passive), followed by atrial systole. If pressure in ventricles is greater than in atria, valves open and blood leaves. Check 2 igures from the presentaion (pressure graphs) Push out in one stroke stroke volume. Cardiac output blood pumped by the heart in a minute. Q (cardiac output ml/min) = hr (b/min) x sv. Edv and sv, hr, co is unchanged. Neural control (ans: sympatheic (ne, parasympatheic (ach) Hormonal control: epinephrine (from adrenal medulla, thyroid hormones, insulin and glucagon (pancreas) Factors afecing cardiac output: heart rate: determined by sa node. During phase 2, both valves are closed. iring frequency.
