PHYSL402 Lecture Notes - Lecture 14: Stroke Volume, Cardiac Nerve, Cardiac Output

• School: University of Alberta
• Department: Physiology
• Course: PHYSL402
• Professor: Dr.shamza

Document Summary

Ps arm innervates mainly av and sa node. Sympa nerves innervates av, sa and direct innervation of ventricular myocardium increase hr and contractility of ventricular muscle. Hr = # of contraction (systoles) / min. Can be done via increase in sympa and decrease in ps nerves to heart (usually work in tandem) Volume of blood ejected by ventricle each beat. E(cid:374)d diastoli(cid:272) = hea(cid:396)t full of (cid:271)lood; e(cid:374)d systoli(cid:272) = (cid:449)hat"s left afte(cid:396) s(cid:395)ueezed. Sv = end diastolic v = end systolic v = 130 ml = 60 m l = 70 ml. Ventricular contractility: squeeze better = push more blood out of ventricles. Extracellular electrolyte [ ], k, ca: recall: last class: importance of maintaining. Primary factors affecting stroke volume component of isf constant; ie too much k or ca different types of arrhythmias; too little flaccid heart (not contractile) Intrinsic controls of sv: anything that will cause heart to fill with more (cid:271)lood = (cid:862)i(cid:374)t(cid:396)i(cid:374)si(cid:272) (cid:272)o(cid:374)t(cid:396)ol(cid:863)