BIOL3030 Lecture Notes - Lecture 24: Pulmonary Circulation, Cardiac Output, Heart
7 Nov 2016
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Circulatory circuit: mammals and birds have a completely divided plan, amphibians and turtles, lizards, and snakes have a divided system where blood can mix outside of the heart, crocodilians. Spend a lot of time in water and under water. Not using lungs for a significant period of time. Lungs are getting a higher partial pressure of gasses. Between the pulmonary vessels and the systemic vessels. When the pressure builds up, the blood goes to the systemic circuit instead of the pulmonary circui: convenient aspect under water. Why have an incomplete separation in mammals: in a fetus. When you are a fetus, you are breathing through the placenta, not the lungs. Begins as a vessel that is infused by cardiac muscle tissue. A septum forms, dividing the right and left heart. Regulation of heartbeat and cardiac output: myogenic. The heart controls its own rhythm, nothing comes from the brain: pacemaker. Action potential is not generated with the synapse of the nerve.
