Biology 1201A Lecture Notes - Lecture 20: Pulmonary Artery, Pulmonary Valve, Farnesyl Pyrophosphate
Document Summary
Cellular mechanism of hormone action: after traveling through the body, a hormone eventually reaches the receptor on a target cell, one mechanism: action by secondary messengers hormone binds to a receptor on the outside of a cell. When this happens, the gdp bound to g- protein is transformed to gtp : this transformation to gtp allows the g-protein to move through the membrane and activate the adenylate cyclase. Intro: thorax = includes heart enclosed within ribcage, a lung on either side, & diaphragm muscle underneath. Flow through the heart: blood comes down from arms, neck, head (upper half) into superior vena cava of the heart, while blood from the legs, belly (lower half) into inferior vena cava. Both enter into the right atrium: after the right atrium, blood flows down into the right ventricle (through the tricuspid valve), from the right ventricle, blood passes through the pulmonary valve into left and right pulmonary arteries.