Cardiac muscle cell

Illustration about the anatomy of heart (cardiac) muscle, showing the gross arrangement and microscopic detail. Illustration of myocardial, anatomy, medical - 12493642

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Cardiac muscle

The cardiac conduction system is a group of specialized cardiac muscle cells in the walls of the heart that send signals to the heart muscle causing it to contract. The main components of the cardiac conduction system are the SA node, AV node, bundle of His, bundle branches, and Purkinje fibers.

Cardiac muscle - limited to the heart where its function is to help pump blood. Cardiac muscle is striated and each is joined by intercalated discs. Cardiac muscle has five properties. 1- contract with a regular rhythm. 2 - must function when a person is asleep and awake. 3 - must be highly resistant to fatigue. 4 - cardiocytes must contact in unison. 5 - each contraction must last long enough to expel blood from the chamber.

Cardiac muscle tissue is striated, branched, and has 1-2 nuclei. Cardiac muscle tissue can be recognized by intercalated disks (dark thickened part). Electrical signals at these junctions allow a wave of excitation from cell to cell, aiding in the function of the heart (see chapter 19 for more details). Cardiac muscle cells, commonly called myocytes or cardiomyocytes, are bigger than smooth muscle cells and smaller than skeletal muscle cells. They control involuntary movement (the heart).

Skeletal, Smooth, and Cardiac muscles