What are the cardiac myocytes?

What are the cardiac myocytes?

The cardiac myocyte is a specialized muscle cell that is approximately 25 μ in diameter and about 100 μ in length. The myocyte is composed of bundles of myofibrils that contain myofilaments (Figure 1).

What is the function of cardiac myocytes?

Cardiomyocytes are the cells responsible for generating contractile force in the intact heart. Specialized cardiomyocytes form the cardiac conduction system, responsible for control of rhythmic beating of the heart.

Where are cardiac myocytes?

Cardiac muscle cells also called cardiomyocytes are the contractile myocytes of the cardiac muscle. The cells are surrounded by an extracellular matrix produced by supporting fibroblast cells.

What is unique about cardiac myocytes?

Unique to the cardiac muscle are a branching morphology and the presence of intercalated discs found between muscle fibers.

What is the definition of myocytes?

Medical Definition of myocyte : a contractile cell specifically : a muscle cell.

Why is myocyte important?

The myocytes are extraordinary cells. They are immortal and contract for a lifetime, supporting the peripheral circulation. In order to do so, they have a unique ultrastructure and unique biochemical machinery that allows them to produce enough adenosine triphosphate to support the contraction.

What are the types of myocytes?

Muscle cells, commonly known as myocytes, are the cells that make up muscle tissue. There are 3 types of muscle cells in the human body; cardiac, skeletal, and smooth.

What do myocytes consist of?

Myocytes contain one or two nuclei that are centrally located and oblong. Myofibrils course around the nucleus, leaving at the nuclear poles a conical area free of contractile elements but densely packed with other cellular organelles.

How many myocytes are in the heart?

Indisputable evidence of large number of myocytes in mitosis and evidence of cytokinesis have been found, providing an unsuspected picture of the regenerative capacity of the heart. A normal adult human left ventricle contains ≈5.5×109 myocytes24 and an infarct of 30% would decrease their number to ≈3.8×109.

What do cardiomyocytes do?

The heart is the first formed organ in the developing fetus. During fetal and postnatal development cardiomyocytes become terminally differentiated muscular cells that are connected end to end by gap junctions, allowing concerted contractile activity. The contraction-relaxation cycle of cardiomyocytes is orchestrated by cyclic increases and decreases in intracellular Ca (2+) initiated by depolarization of the sarcolemma and sustained by Ca (2+) release and re-uptake by the sarcoplasmic

Does cardiac muscle have mitochondria?

Cardiac muscles cells are not fused together, but are connected by gap junctions at intercalated discs. Cardiac muscle cells have more mitochondria, as they are more reliant on aerobic respiration than skeletal muscle. What type of skeletal muscle has more mitochondria?

What are the types of cardiac muscle?

Cardiac muscle tissue, or myocardium, is a specialized type of muscle tissue that forms the heart. The human body contains three different kinds of muscle tissue: skeletal, smooth, and cardiac. Only cardiac muscle tissue, comprising cells called myocytes, is present in the heart.

What is the function of myocardial cells?

Cardiac muscle has a longer period of contraction and refraction,which is needed to maintain a viable heartbeat.

  • The heart tissue does not become fatigued (unlike skeletal muscle),allowing for continuous,life-long contractions.
  • The interconnected network of cells is separated between atria and ventricles,allowing them to contract separately.