BIOL 103 Lecture Notes - Lecture 3: Endoplasmic Reticulum, Potassium Channel, Neuroglia
21 Oct 2017
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Bio week 15. 1 lecture notes shut down na+ k+ pump: accumulate sodium ions in the inside osmotic potential increases cell bursts. Disuse atrophy: decrease in number of myofilaments in each muscle fibre: not losing cells, muscle fibres losing amount of myosin and actin molecules in each of the cells. Daily exercises using full range of motion in space minimize contractile protein loss i(cid:374) spa(cid:272)e, (cid:455)ou do(cid:374)"t ha(cid:448)e to (cid:449)ork agai(cid:374)st gra(cid:448)it(cid:455) Muscle anatomy (skeletal muscle fibres: sarcolemma (plasma membrane), sarcoplasmic reticulum (endoplasmic reticulum), sarcoplasm (cytoplasm), mitochondria, nuclei, etc, multi nuclei cell for skeletal muscle. Multi nuclei cell of skeletal muscle: repeated nuclei division (mitosis) with no cytokinesis wrong, fusion of cells correct. Myoblasts: immature muscle cells experiment: single nucleus rich medium mitosis, produces beta actin (from myoblasts, add stress: starve myoblasts through poor medium (no serum) cells start to fuse multinucleic, produces alpha actin. Nervous system: cns, pns: cns: brain + spinal cord, pns: anything else.
