Definition of Heart muscle

1. Noun. The muscle tissue of the heart; adapted to continued rhythmic contraction.


Medical Definition of Heart muscle

1. Tissue specialised for contraction. See twitch muscle, catch muscle: Cardiac muscle (heart muscle) is a striated but involuntary muscle responsible for the pumping activity of the vertebrate heart. The individual muscle cells are joined through a junctional complex known as the intercalated disc and are not fused together into multinucleate structures as they are in skeletal muscle. Skeletal muscle is a rather non-specific term usually applied to the striated muscle of vertebrates that is under voluntary control. The muscle fibres are syncytial and contain myofibrils, tandem arrays of sarcomeres. Smooth muscle is muscle tissue in vertebrates made up from long tapering cells that may be anything from 20-500m long. Smooth muscle is generally involuntary and differs from striated muscle in the much higher actin/myosin ratio, the absence of conspicuous sarcomeres and the ability to contract to a much smaller fraction of its resting length. Smooth muscle cells are found particularly in blood vessel walls, surrounding the intestine (especially the gizzard in birds) and in the uterus. The contractile system and its control resemble those of motile tissue cells (for example fibroblasts, leucocytes) and antibodies against smooth muscle myosin will cross react with myosin from tissue cells, whereas antibodies against skeletal muscle myosin will not. See: dense bodies. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)

Lexicographical Neighbors of Heart Muscle

heart catheterization
heart cherry
heart condition
heart conduction system
heart disease
heart failure
heart failure cells
heart failure in kids
heart hormone
heart injuries
heart line
heart monitor
heart murmur
heart murmurs
heart muscle (current term)
heart of gold
heart of hearts
heart pea
heart position
heart rate monitor
heart rhythm
heart rupture
heart sac
heart septal defects
heart septum
heart sounds
heart specialist

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