01:119:116 Lecture Notes - Lecture 24: Gastrovascular Cavity, Heart Valve, Pulmonary Artery
16 Apr 2016
School
Department
Course
Professor
Document Summary
Muscles move fluid by movement of living organism. Blood=circ fluid, confined to bv in entire circuit. Higher p, more efficient, requires more e. Capillary bed=network of capillaries, infiltrate all tissues. Starts off high and drops off as blood travels through narrow vesicles. Blood flow circuits:pulmocutaneous (oxygenate through skin), systemic. Heart 4 chambers: 2 atria, 2 ventricles. Volume blood/min pumped by left ventricle (throughout body, has highest volume) Heart murmur-blood moves backwards through defective valve abnormal sound. Sinoatrial node (sa) pacemaker of the heart-small mass of cardiac muscle, ra. Impulse from sa node spreads through atria. Ap reaches atrioventricular node (av)- autorhythmic cells in septum b/w ra, rv. Allows atria to complete contraction before ventricles start. Transmitted via bundle branches av node heart apex. Baroreceptors=sensory receptors, walls of blood vessels, heart. Detect change in bp cardiac centers in medulla autonomic nerves sa nerves. 3 layers in arteries, veins-inside to outside. Smooth muscle-thicker in arteries (higher pressure), thin in veins.
