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Anatomy- Chapter 9

Muscle Fibers Another name for muscle cells.
Myofilaments Actin and Myosin-microfilaments. Includes both of the two.
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.
Cardiac Muscle only occurs in the heart; involuntary; striated; coordinated activity to act like a pump.
Smooth Muscle found in walls of hollow visceral organs; no strations; involuntary; coordinated activity to act like a pump.
Excitability (irritability); abiliy to receive and respond to a stimulus, that is, any change in environment.
Contractility ability to be stretched or extended.
Elasticity ability of a muscle fiber to recoil and resume its resting length after being stretched.
4 main functions of Muscle 1. Producing Movement 2. Maintaining Posture 3. Stabilizing Joints 4. Generating Heat
Insertion "moveable bone" ; contracts, and moves toward the immovable or less movable bone.
Origin "immovable bone" ; lies proximal to the insertion.
Sarcoplasmis Reticulum an elaborate smooth endoplasmic reticulum, with interconnecting tubules surrounding each myofibril. Create channels called "terminal cisternae" ; place where Calcium Ions are stored.
Created by: cbranham12