BIO 3303 Lecture Notes - Lecture 4: Cardiac Muscle Cell, Myofibril, Treadmilling
11 Jan 2019
School
Department
Course
Professor
Document Summary
Scaling (bones and muscles), bone plasticity, muscles as levers. Cost of transport (cot) is the energy that it takes to move over ground. For our purposes, this will be defined as o2 intake/distance. There"s an underline cost of energy that"s just keeping the system alive. If you stand, and never walk, eventually you"ll run out of energy. If you move super slowly, you need to constantly put energy into the muscles. The slower you go, the more energy you need to use while moving only a minimal distance. Per unit distance, you are using more energy. Spread out vs concentrated changes pigment appearance. They do this by moving the melanophores along the cells. Animals are the main multicellular organisms that can move from location to location. They do this by evolving the muscle cells (myocytes). Simplest multicellular animals lack true muscles, but they do have contractile cells. Cnidarians have myoepithelial cells (starting to get muscle-like, but not quite there).
