Cardiac Muscle Tissue
A Cardiac Muscle Tissue is a vertebrae striated muscle tissue that is responsible for the rhythmic contractions of a heart organ.
- AKA: Heart Muscle.
- Context:
- It can range from being a Healthy Muscle Tissue to being a Unhealthy Muscle Tissue (such as damaged muscle tissue).
- It can contain specialized Pacemaker Cells (that generate electrical impulses).
- It can be highly adaptable and adjust its contraction strength and frequency to meet the body's demands.
- It can be made up of branching cells connected by intercalated discs.
- It can be vulnerable to Cardiac Tissue Damage and Cardiac Tissue Disease.
- …
- Counter-Example(s):
- See: Myocardial Infarction, Acute Coronary Syndrome (ACS), Pericardium, Endocardium, Coronary Circulation, Cardiac Muscle Cells.
References
2022
- (Wikipedia, 2022) ⇒ https://en.wikipedia.org/wiki/cardiac_muscle Retrieved:2022-12-8.
- Cardiac muscle (also called heart muscle or myocardium) is one of three types of vertebrate muscle tissues, with the other two 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 heart wall (the pericardium) and the inner layer (the endocardium), with blood supplied via the coronary circulation. It is composed of individual cardiac muscle cells joined by intercalated discs, and encased by collagen fibers and other substances that form the extracellular matrix.
Cardiac muscle contracts in a similar manner to skeletal muscle, although with some important differences. Electrical stimulation in the form of a cardiac action potential triggers the release of calcium from the cell's internal calcium store, the sarcoplasmic reticulum. The rise in calcium causes the cell's myofilaments to slide past each other in a process called excitation-contraction coupling.
Diseases of the heart muscle known as cardiomyopathies are of major importance. These include ischemic conditions caused by a restricted blood supply to the muscle such as angina, and myocardial infarction.
- Cardiac muscle (also called heart muscle or myocardium) is one of three types of vertebrate muscle tissues, with the other two 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 heart wall (the pericardium) and the inner layer (the endocardium), with blood supplied via the coronary circulation. It is composed of individual cardiac muscle cells joined by intercalated discs, and encased by collagen fibers and other substances that form the extracellular matrix.