Chapter 4: Muscle

Keywords

Please familiarize yourself with these keywords before you start reading the chapter:

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Cardiac muscle
A type of striated muscle found specifically in the heart or myocardium.
Intercalated disc
A structure specific to cardiac muscle formed from gap junctions and desmosomes that allow cardiac muscle cells to contract in a coordinated fashion.
Myofibers
The term for a muscle cell. Applies to skeletal muscle, cardiac muscle and smooth muscle.
Myofibrils
The tube like organelle present in skeletal muscle and cardiac muscle that coordinates contraction of the cell.
Purkinje fibers
Modified cardiomyocytes that propagate electrical signals through the cardiac muscle of the myocardium allowing coordinated contraction.
Sarcomere
The basic functional unit of striated muscle that is composed of myofilaments.
Sarcoplasmic reticulum
The organelle that is responsible for the storage and release of calcium into the cytosol of the myofiber.
Skeletal muscle
A type of striated muscle responsible for voluntary movement.
Smooth muscle
Non-striated muscle that is responsible for involuntary movement within several organ systems.
T tubules
Invaginations of the sarcolemma (cell membrane) into the cell that allows for the conduction of depolarization impulses from the outside of the cell to around the sarcomeres.

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Keywords by Ryan Jennings and Christopher Premanandan is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License, except where otherwise noted.

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