BIOL 15b Lecture Notes - Lecture 26: Pulmonary Artery, Pulmonary Vein, Heme

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Nervous system is much faster and more specific than the endocrine system. Nervous system is organized in mostly the brain and the spine but also throughout rest of body. Function - produce skeletal movement, maintain body position. 1 or 2 nuclei per cell involuntary. 99% calcium in body stored in bones. Large multicellular organisms use bulk flow and diffusion. Rate of diffusion = k x a x ((p2 - p1) / d) Rate is the amount of o2 over time. P2 = partial pressure of o2 where it"s going. P1 = partial pressure o2 where coming from. D = thickness of the barrier it is crossing. Life expectancy goes up with lower heart rate. A protein molecule carried in red blood cells. 4 subunits each with heme group with a porphyrin ring. Porphyrin ring can change shape which alters its ability to bind oxygen. Gives blood the red or blue color.

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