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Cardiac muscle (also called heart muscle or myocardium) is one of three types of vertebrate muscle tissues, the other being skeletal muscle and smooth muscle. It is an involuntary, striated muscle that constitutes the main tissue of the wall of the heart. The cardiac muscle (myocardium) forms a thick middle layer between the outer layer of the ...
Cardiac excitation-contraction coupling ( Cardiac EC coupling) describes the series of events, from the production of an electrical impulse (action potential) to the contraction of muscles in the heart. [1] This process is of vital importance as it allows for the heart to beat in a controlled manner, without the need for conscious input.
Intercalated discs or lines of Eberth are microscopic identifying features of cardiac muscle. Cardiac muscle consists of individual heart muscle cells ( cardiomyocytes) connected by intercalated discs to work as a single functional syncytium. By contrast, skeletal muscle consists of multinucleated muscle fibers and exhibits no intercalated discs.
HANNA ARHIROVA. August 2, 2024 at 2:26 PM. PARIS (AP) — He calls himself a “troglodyte” with his brushes, oil paints, and large canvas among the photographers with expensive cameras and long ...
J.R. Reed’s three kids were scattered in different states across the country this week. They all had tickets to get home — on Delta.
Heart rate is the frequency of the heartbeat measured by the number of contractions of the heart per minute ( beats per minute, or bpm). The heart rate varies according to the body's physical needs, including the need to absorb oxygen and excrete carbon dioxide. It is also modulated by numerous factors, including (but not limited to) genetics ...
People tend to slow down at night, whether it’s reading, catching up with family or watching TV, and adding in small bursts of exercise helps to break this up and support good sleep, she points out.
All-or-none law. In physiology, the all-or-none law (sometimes the all-or-none principle or all-or-nothing law) is the principle that if a single nerve fibre is stimulated, it will always give a maximal response and produce an electrical impulse of a single amplitude. If the intensity or duration of the stimulus is increased, the height of the ...