Anatomy- Chapter 9
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Muscle Fibers | Another name for muscle cells.
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| Myofilaments | Actin and Myosin-microfilaments. Includes both of the two.
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| Skeletal Muscle Tissue | packaged into the skeletal msucles, organs that attach to and cover the bony skeleton; are longest muscle cells; are striated, and are controlled voluntarily; connect muscle to bone; referred to as muscular system.
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| Cardiac Muscle | only occurs in the heart; involuntary; striated; coordinated activity to act like a pump.
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| Smooth Muscle | found in walls of hollow visceral organs; no strations; involuntary; coordinated activity to act like a pump.
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| Excitability | (irritability); abiliy to receive and respond to a stimulus, that is, any change in environment.
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| Contractility | ability to be stretched or extended.
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| Elasticity | ability of a muscle fiber to recoil and resume its resting length after being stretched.
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| 4 main functions of Muscle | 1. Producing Movement
2. Maintaining Posture
3. Stabilizing Joints
4. Generating Heat
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| Insertion | "moveable bone" ; contracts, and moves toward the immovable or less movable bone.
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| Origin | "immovable bone" ; lies proximal to the insertion.
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| Sarcoplasmis Reticulum | an elaborate smooth endoplasmic reticulum, with interconnecting tubules surrounding each myofibril. Create channels called "terminal cisternae" ; place where Calcium Ions are stored.
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