01:119:116 Lecture Notes - Lecture 21: Echinoderm, Mollusca, Endoskeleton
11 Jan 2020
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Lecture 21 - musculoskeletal system: vertebrate skeletal muscle, sliding filament model. 5. atp hydrolyzed - mosin head returns to high energy position. No atp made - no new bridges. Ca2+ not returned to sr = muscle becomes stiff: other types of muscles, cardiac muscle. Intercalated discs - specialized junctions permit ions to move between cells. Action potentials can quickly pass to all cells: smooth muscle. Movement: skeletal muscles, functions, types of skeletons. Living tissue and grows & changes through life. All animals are heterotrophs - must eat: four stages of food processing. Suspension feeders - eat from the surrounding. Substrate feeders - live on or in what they are eating. Bulk feeders - need food a couple times a day not all the time. 2. digestion - process of breaking down complex organics. Mechanical - making big pieces into smaller piece so that water and enzymes can come and break it down easily.
