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Physiology 1-6

Articulations and Muscle Contraction

TermDefinition
Actin Thin protein filament involved in muscle contraction.
Myosin Thick protein filament that pulls on actin to cause contraction.
T-tubules (Transverse Tubules) Channels that carry the action potential deep into the muscle fiber.
Sarcoplasmic Reticulum (SR) Organelle that stores and releases calcium ions (Ca²⁺) during contraction.
Calcium Ions (Ca²⁺) Released from SR; bind to troponin to start muscle contraction.
Fibrous Joint Bones joined by dense connective tissue; little or no movement.
Cartilaginous Joint Bones joined by cartilage; allows limited movement.
Synovial Joint A freely movable joint surrounded by a capsule and filled with synovial fluid.
Ligament Tough connective tissue that connects bone to bone and stabilizes joints.
Bursa Fibrous connective tissue connecting muscle to bone; helps move the joint.
Tendon Fluid-filled sac that reduces friction between moving parts (e.g., between bone and tendon).
Created by: gxzselle
 

 



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