MEDI113 Lecture Notes - Lecture 2: Pulmonary Vein, Pulmonary Artery, Cardiac Output
8 Aug 2018
School
Department
Course
Professor
Document Summary
Maximal oxygen consumption and the cardiovascular response to different types of exercise. Purpose: transport of o2 and nutrients to tissues, removal of co2 wastes from tissues, regulation of body temperature, transports hormones to tissues. Parts: pressure pump, heart, are there other pumps, delivery plumbing, arteries, arterioles, capillaries, return plumbing, veins, venules, transport medium, blood. Fitness and peak heart rate: athlete: hr peak = 190, sedentary: hr peak = 195, cardiac disease: hr peak = 195. Fitness and resting heart rate: athlete: hr rest = 35, sedentary: hr rest = 60, cardiac disease: hr rest = 60. Contraction of the heart depends on electrical stimulation of the myocardium. Conductional system: sinoatrial node (sa node, pacemaker, initiates depolarisation, atrioventricular node (av node, passes depolarisation to ventricles, brief delay to allow for ventricular filling, bundle branches, to left and right ventricle, purkinje fibres, throughout ventricles. Parasympathetic nervous system: via vagus nerve, slows hr in inhibiting sa and av nodes.
