Muscle control

Muscle control - Muscle control Muscle types: 1.) smooth...

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Muscle control Muscle types: 1.) smooth muscle/visceral = involuntary 2.) cardiac: gap junctions 3.) skeletal: striated b/c are striped. Good for strong, rapid contractions. 1.) Muscle structure: a. Many cells fuse together to have one muscle fiber, which has 10-20 myofibrils. a.i. Zig zag in myofibril b. Unit that allows muscle to contract = sarcomere. c. Myofibrils consist of two types of myofilaments: c.i. Thik filaments: myosin filaments. c.ii. Thin: actin 2 twisted strands. . if viewing under e- miecho, if look at these, protein sarand tat ware d. How does muscle contraction work: d.i. Interaction between myosin and actin. d.ii. Actin myosin niteraction: d.ii.1. Whe myosin contract, myosin heads pull actin on the inside. \ d.ii.2. Power stroke e. Problem = how do you have a muscle at rest and how do you stimulate muscle? f. Calcium g. Topomyosin covers the myosin binding sites when muscle is relaxed. h.
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Muscle control - Muscle control Muscle types: 1.) smooth...

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