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the muscular tissue of the heart
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



the muscular layer that constitutes most of the heart. It consists of striated muscle tissue made up of a dense aggregation of muscle cells. A functional characteristic of the myocardium is rhythmic, automatic contraction alternating with relaxation, which continues without interruption throughout the life of the organism.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


The muscular tissue of the heart wall.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
There has been much activity lately in the area of regenerative therapy for patients with a weakened heart muscle. Several different types of cellular injections are being studied to determine if they can improve heart muscle function under certain conditions, such as after a large heart attack that results in congestive heart failure.
The scar forms a barrier to these signals so that they can't reach the heart muscle.
But when the damage is permanent, the heart muscle becomes weaker and at risk for potential arrhythmias.
As the heart muscle becomes thicker the chambers within the heart get smaller and so can hold a smaller volume of blood.
Changes to a normal ECG recording can provide insight into electrolyte abnormalities, structural heart conditions like hypertrophy (thickening of the heart muscle) or diseases like sarcoidosis or amyloidosis, in which muscle tissue is replaced by protein.
The finding suggests that not all individuals are destined to permanent heart muscle loss after a heart attack, but rather some can naturally recover both heart muscle mass and function.
Within a couple of days, the micro tissues resembled heart muscle both structurally and functionally.
A second cocktail of chemicals and growth factors helped transition the cells to become heart muscle cells.
Over time, the heart muscle becomes thicker to compensate for the extra work it must perform.
The condition is caused by the narrowing of a major valve, which puts heart muscle under pressure and reduces its capacity to pump properly.
Under this extra workload, the heart muscle dilates, the walls of the heart thin, and the heart further remodels, thereby causing another cycle of dilation and overcompensation.
Hawthorn has additional characteristics that strengthen and tone the heart muscle, (2) making it a potential adjuvant therapy in the face of congestive heart failure.

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