What is cardiac muscle?

  • (noun): The muscle tissue of the heart; adapted to continued rhythmic contraction.
    Synonyms: heart muscle

Cardiac Muscle

Cardiac muscle (heart muscle) is a type of involuntary striated muscle found in the walls and histological foundation of the heart, specifically the myocardium. Cardiac muscle is one of three major types of muscle, the others being skeletal and smooth muscle. The cells that comprise cardiac muscle, called cardiomyocytes or myocardiocytes, can contain one, two, or (very rarely) three or four nuclei. Coordinated contractions of cardiac muscle cells in the heart propel blood out of the atria and ventricles to the blood vessels of the left/body/systemic and right/lungs/pulmonary circulatory systems. This complex of actions makes up the systole of the heart.

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Some articles on cardiac muscle:

... sarcomere Biological process • striated muscle contraction • neuromuscular synaptic transmission • positive regulation of gene expression ...
Muscles - Anatomy - Microanatomy
... Skeletal muscles are sheathed by a tough layer of connective tissue called the epimysium ... The epimysium anchors muscle tissue to tendons at each end, where the epimysium becomes thicker and collagenous ... It also protects muscles from friction against other muscles and bones ...
Cardiac Muscle - Regeneration of Heart Muscle Cells
... Until recently, it was commonly believed that cardiac muscle cells could not be regenerated ... and his colleagues at the Karolinska Institute in Stockholm tested samples of heart muscle from people born before 1955 when nuclear bomb testing caused elevated ... from people born before 1955 did have elevated carbon 14 in their heart muscle cell DNA, indicating that the cells had divided after the person's birth ...
... inhibits the transmembrane influx of calcium ions into cardiac muscle and smooth muscle without changing serum calcium concentrations ... The contractile processes of cardiac muscle and vascular smooth muscle are dependent upon the movement of extracellular calcium ions into these cells ... The effects of nicardipine are more selective to vascular smooth muscle than cardiac muscle ...
... synaptic transmission • regulation of heart contraction • positive regulation of cardiac muscle hypertrophy • regulation of cardiac muscle contraction by regulation ...