BIOL 2410 Chapter Notes - Chapter 3: Mitosis, Cell Potency, Cardiac Muscle
29 Mar 2018
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Excitable tissues are the muscle and neural tissues because they can generate action potentials. They have minimal ec, limited to the supportive layer the external lamina, some cells have gap junctions allowing quick propagation. Muscle tissue: contracts to make movement: cardiac muscle, smooth muscle, skeletal muscle. Neural tissue: neurons and glial cells (support cells for the neurons) Apoptosis is a tidy form of cell death. Necrosis: cells die from physical trauma, toxins, or lack of oxygen: these cells swell and their organelles deteriorate, eventually rupturing, digestive enzymes are released causing inflammation of adjacent cells. Apoptosis: programmed cell death: don"t disrupt adjacent cells, regulated by chemical signals, cell shrinks and breaks into blebs which are eaten by neighboring cells, important in fetal development. Mitosis occurs during fetal development from the single cell that everything starts form. Totipotent cells: ability to develop into any and all types of specialized cells: could develop into an organism.
