Logan Steele
Cardiac muscle, also known as heart muscle or myocardium, is striated. This means that it appears striped under a microscope. The striation is due to the regular alternation of the contractile proteins actin and myosin. Cardiac muscle is involuntary and forms the contractile walls of the heart.
| Characteristics | Values |
|---|---|
| Striated | Yes |
| Involuntary | Yes |
| Number of nuclei | One |
| Position of nucleus | Central |
| Shape | Branched |
| Location | Wall of the heart |
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What You'll Learn
- Cardiac muscle is striated, like skeletal muscle, due to the arrangement of actin and myosin in sarcomeres
- Cardiac muscle is involuntary
- Cardiac muscle cells usually have a single, central nucleus
- The cells are often branched and are tightly connected by specialised junctions
- The region where the ends of the cells are connected to another cell is called an intercalated disc
Cardiac muscle is striated, like skeletal muscle, due to the arrangement of actin and myosin in sarcomeres
Cardiac muscle forms the contractile walls of the heart. The cells of cardiac muscle, known as cardiomyocytes, also appear striated under the microscope. Unlike skeletal muscle fibres, cardiomyocytes are single cells typically with a single centrally located nucleus. Cardiac muscle is short, branched, and has a single central nucleus. It contracts to pump blood and is found only in the heart.
Cardiac muscle is involuntary, unlike skeletal muscle. Cardiac muscle cells usually have a single (central) nucleus. The cells are often branched, and are tightly connected by specialised junctions. The region where the ends of the cells are connected to another cell is called an intercalated disc. The intercalated disc contains gap junctions, adhering junctions and desmosomes. Gap junctions allow the muscle cells to be electrically coupled, so that they beat in synchrony.
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Cardiac muscle is involuntary
Cardiac muscle is striated, like skeletal muscle, as the actin and myosin are arranged in sarcomeres. However, cardiac muscle is involuntary. This means that it is not under conscious control and a person cannot make it contract at will. Instead, cardiac muscle is controlled by both the autonomic nervous system and its own pacemaker cells, which cause it to contract automatically and rhythmically.
Cardiac muscle is short and branched, with a single central nucleus. It is found only in the heart, where it forms the contractile walls of the heart. The cells of cardiac muscle, known as cardiomyocytes, are single cells with a single centrally located nucleus. They are often branched and are tightly connected by specialised junctions. The region where the ends of the cells are connected to another cell is called an intercalated disc. The intercalated disc contains gap junctions, adhering junctions and desmosomes. Gap junctions allow the muscle cells to be electrically coupled, so that they beat in synchrony.
Cardiac muscle is one of three types of vertebrate muscle tissues, the others being skeletal muscle and smooth muscle. Smooth muscle is found in the internal organs and blood vessels and is also involuntary. Skeletal muscle, on the other hand, is voluntary and is found in the arms and legs.
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Cardiac muscle cells usually have a single, central nucleus
Cardiac muscle is striated, like skeletal muscle, as the actin and myosin are arranged in sarcomeres. However, cardiac muscle is involuntary. Cardiac muscle cells usually have a single, central nucleus. The cells are often branched, and are tightly connected by specialised junctions. The region where the ends of the cells are connected to another cell is called an intercalated disc. The intercalated disc contains gap junctions, adhering junctions and desmosomes. Gap junctions allow the muscle cells to be electrically coupled, so that they beat in synchrony.
Cardiac muscle forms the contractile walls of the heart. The cells of cardiac muscle, known as cardiomyocytes, also appear striated under the microscope. Unlike skeletal muscle fibres, cardiomyocytes are single cells typically with a single centrally located nucleus. Under the light microscope, muscle cells appear striated with many nuclei squeezed along the membranes. The striation is due to the regular alternation of the contractile proteins actin and myosin, along with the structural proteins that couple the contractile proteins to connective tissues. The cells are multinucleated as a result of the fusion of the many myoblasts that fuse to form each long muscle fibre.
Cardiac muscle is short, branched, appears striated, and has a single central nucleus. It contracts to pump blood and is found only in the heart. Cardiac muscle (also called heart muscle or myocardium) is one of three types of vertebrate muscle tissues, the others 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.
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The cells are often branched and are tightly connected by specialised junctions
Cardiac muscle is striated, like skeletal muscle, as the actin and myosin are arranged in sarcomeres, just as in skeletal muscle. However, cardiac muscle is involuntary. Cardiac muscle cells usually have a single (central) nucleus. The cells are often branched, and are tightly connected by specialised junctions. The region where the ends of the cells are connected to another cell is called an intercalated disc. The intercalated disc contains gap junctions, adhering junctions and desmosomes. Gap junctions allow the muscle cells to be electrically coupled, so that they beat in synchrony.
Cardiac muscle is short, branched, and striated. It has a single central nucleus. It contracts to pump blood and is found only in the heart. The cells of cardiac muscle, known as cardiomyocytes, also appear striated under the microscope. Unlike skeletal muscle fibres, cardiomyocytes are single cells typically with a single centrally located nucleus.
Cardiac muscle is one of three types of vertebrate muscle tissues, the others 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 fibres and other substances that form the extracellular matrix.
Cardiac muscle cells are located in the walls of the heart, appear striped (striated), and are under involuntary control.
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The region where the ends of the cells are connected to another cell is called an intercalated disc
Cardiac muscle is striated, like skeletal muscle, as the actin and myosin are arranged in sarcomeres, just as in skeletal muscle. The cells of cardiac muscle, known as cardiomyocytes, also appear striated under the microscope. The striation is due to the regular alternation of the contractile proteins actin and myosin, along with the structural proteins that couple the contractile proteins to connective tissues.
Cardiac muscle forms the contractile walls of the heart. 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.
Cardiac muscle cells usually have a single (central) nucleus. The cells are often branched, and are tightly connected by specialised junctions. The region where the ends of the cells are connected to another cell is called an intercalated disc. The intercalated disc contains gap junctions, adhering junctions and desmosomes. Gap junctions allow the muscle cells to be electrically coupled, so that they beat in synchrony.
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Frequently asked questions
Yes, cardiac muscles are striated.
Striated means that the contractile fibrils in the cells are aligned in parallel bundles, so that their different regions form stripes visible in a microscope.
Striated muscle is under voluntary control, whereas non-striated muscle is under involuntary control.
An example of a striated muscle is the cardiac muscle, which forms the contractile walls of the heart.
