01:119:116 Lecture Notes - Lecture 21: Myocyte, Endoplasmic Reticulum, Motor Neuron
25 Jul 2017
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Document Summary
Vertebrate skeletal muscle: c/c, seq, seq, iov muscle contraction. Other types of muscle: c/c types of muscle. Feeding, peristalsis (moving food through digestive system) Attached to bones via tendons cords of connective tissue. Multinucleate many cells are fused together (many nuclei per cell) T (transverse) tubule infolding of pm. Sarcoplasmic reticulum modified er of muscle cells; borders t tubules. Each has a head and tail heads stick out and interact when muscles contract. Best organized in muscle cells: their arrangement together is what makes muscle work. Filaments arranged in a regular pattern have a striped appearance. Basic contractile unit one unit of overlapping thin and thick filaments. Muscle muscle fiber (cells) myofibrils sarcomeres. Myofibril = hundreds of sarcomeres end to end. Sarcomere is the structure that does the contracting. Dividing line that separates sarcomeres is called z line a layer of protein that actin is embedded in. M line region where middle of thick filaments are aligned.
