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Cardiac muscle, also known as myocardium or heart muscle, is a specialised type of tissue that exists only in the heart. It is responsible for keeping the heart pumping and circulating blood around the body. The heart wall is a three-layered structure, with a thick layer of myocardium sandwiched between the inner endocardium and the outer epicardium or pericardium. The contraction of individual cardiac muscle cells produces force and shortening in these bands of muscle, resulting in the ejection of blood into the pulmonary and systemic vessels.
| Characteristics | Values |
|---|---|
| Types of muscle tissue in the body | 3 (Skeletal, Smooth, and Cardiac) |
| Organs with cardiac muscle | Heart |
| Cardiac muscle tissue | Myocardium |
| Cardiac muscle cells | Cardiomyocytes |
| Conditions that affect cardiac muscle tissue | Cardiomyopathy |
| Types of cardiomyopathy | Hypertrophic, Dilated, Restrictive, Arrhythmogenic Right Ventricular Dysplasia |
| Effects of aerobic exercise on cardiac muscle | Strengthens cardiac muscle tissue, lowers the risk of heart attack, stroke, and other cardiovascular conditions |
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What You'll Learn
Cardiac muscle is only found in the heart
Cardiac muscle, also called myocardium or heart muscle, is a specialised type of striated involuntary muscle tissue that exists exclusively in the heart. It is one of the three types of muscle tissues in the body, the other two being skeletal and smooth muscle tissues.
The cardiac muscle forms the bulk of the heart, constituting the main tissue of the heart wall. It is a thick layer of myocardium sandwiched between the inner endocardium and the outer epicardium (also known as the visceral pericardium). The inner endocardium lines the cardiac chambers, covers the cardiac valves, and joins with the endothelium that lines the blood vessels connected to the heart. The outer epicardium forms part of the pericardial sac that surrounds, protects, and lubricates the heart. The cardiac muscle cells form a highly branched cellular network in the heart.
Cardiac muscle tissue contains cardiac muscle cells that work together to produce rhythmic, wave-like contractions known as the heartbeat. These contractions result in the heart pumping blood through the circulatory system. The contractions are involuntary and highly coordinated, allowing the ventricles to squeeze in several directions simultaneously – longitudinally (becoming shorter from apex to base), radially (becoming narrower from side to side), and with a twisting motion.
Regular aerobic exercise can help strengthen cardiac muscle tissue, lower the risk of heart attack, stroke, and other cardiovascular conditions, and reduce the risk of developing cardiomyopathy.
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It is responsible for the heart's pumping action
Cardiac muscle, also known as myocardium or heart muscle, is a specialised type of tissue that is only found in the heart. It is one of the three types of muscle tissues in the body, the other two being skeletal and smooth muscle.
Cardiac muscle is responsible for the heart's pumping action, keeping the heart pumping and blood circulating around the body. This is achieved through involuntary, coordinated contractions of the cardiac muscle cells, which allow blood to be pumped through the circulatory system. These contractions are rhythmic, wave-like movements known as the heartbeat. The contraction of individual cardiac muscle cells produces force and shortening in the bands of muscle, resulting in a decrease in heart chamber size and the consequent ejection of blood.
The cardiac muscle forms a thick middle layer of the heart wall, between the outer layer (the pericardium or epicardium) and the inner layer (the endocardium). It is composed of individual cardiac muscle cells or cardiomyocytes, which are joined by intercalated discs and encased by collagen fibres and other substances that form the extracellular matrix.
The contraction of the cardiac muscle is involuntary and automatic, occurring in response to electrical impulses from the nervous system. These impulses trigger the release of calcium from the cell's internal calcium store, the sarcoplasmic reticulum, causing the cell's myofilaments to slide past each other in a process called excitation-contraction coupling. Regular aerobic exercise can help strengthen cardiac muscle tissue, improving its pumping action and lowering the risk of cardiovascular conditions.
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Cardiac muscle tissue has three types of cells
Cardiac muscle tissue, also known as myocardium, is a specialised type of tissue that exists only in the heart. It is responsible for keeping the heart pumping and blood circulating around the body. This tissue has three types of cells: fibroblasts, smooth muscle cells, and cardiomyocytes.
Fibroblasts are a type of cell that produces collagen and other fibres that provide structural support for tissues and help in wound healing. Smooth muscle cells, also known as myoepithelial cells, are spindle-shaped and located in the walls of hollow visceral organs, such as the liver, pancreas, and intestines. They help to move substances through these organs and are also involved in processes like digestion and breathing.
Cardiomyocytes are the cells that make up the bulk of the cardiac muscle tissue. They are responsible for the heart's contractility and pumping action. These cells have a unique ability to contract and relax in a coordinated manner, allowing the heart to pump blood effectively. Cardiomyocytes are also highly adaptable, growing and changing in response to factors like extensive exercise, heart disease, or injury.
Additionally, cardiac muscle tissue contains specialised "pacemaker" cells. These cells are comprised of sinoatrial (SA) nodes and atrioventricular (AV) nodes, which generate electrical impulses that trigger the contraction and relaxation of the cardiac muscle cells. Pacemaker cells have their own autorhythmicity, allowing them to spontaneously depolarize and initiate the heart's electrical activity without external stimulation.
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Cardiomyopathies are diseases of the heart muscle
Cardiac muscle is a specialised type of tissue that exists only in the heart. It is responsible for keeping the heart pumping and circulating blood around the body. The heart wall is a three-layered structure with a thick layer of myocardium (cardiac muscle) sandwiched between the inner endocardium and the outer epicardium.
There are several types of cardiomyopathies, including dilated cardiomyopathy, hypertrophic cardiomyopathy (HCM), and restrictive cardiomyopathy (RCM). Dilated cardiomyopathy causes the left ventricle to stretch and the heart chambers to dilate. HCM is a genetic condition where the cardiomyocytes do not have a typical formation, interrupting blood flow out of the ventricles. RCM occurs when the ventricle walls stiffen, preventing adequate filling of blood.
Cardiomyopathies can be acquired due to another disease, condition, or factor, or inherited due to genetic factors passed on from parents. Causes of cardiomyopathy include coronary artery disease, autoimmune diseases, infections, heart inflammation, thyroid disease, muscular dystrophy, high cholesterol, and amyloidosis. Treatment can slow the progression of cardiomyopathy and improve quality of life, but it does not cure the condition.
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Aerobic exercise can help keep cardiac muscle tissue strong
Cardiac muscle tissue, also known as myocardium, exists only in the heart. It is responsible for keeping the heart pumping and circulating blood around the body. The heart wall is a three-layered structure, with a thick layer of myocardium sandwiched between the inner endocardium and the outer epicardium.
Cardiac muscle contains cardiac muscle cells, which perform highly coordinated actions that keep the heart pumping. The cardiac cells work together to produce the rhythmic, wave-like contractions known as the heartbeat. These contractions use a lot of energy, requiring a constant flow of blood to provide oxygen and nutrients.
Aerobic exercise is an effective way to strengthen the heart muscle and improve its ability to pump blood. It increases overall aerobic fitness and improves circulation, resulting in lower blood pressure and heart rate. This type of exercise also helps to reduce the risk of type 2 diabetes and lower cholesterol levels. Additionally, aerobic exercise can improve cardiovascular endurance, allowing individuals to exercise for longer at medium to high intensity without getting tired.
Regular aerobic exercise helps to keep cardiac muscle tissue strong and healthy. It is recommended to engage in at least 30 minutes of aerobic activity, such as brisk walking, running, swimming, or cycling, for at least five days a week. This can also be achieved through moderate-intensity activities like jumping rope or playing tennis for at least 150 minutes per week.
However, it is important to note that vigorous aerobic activity may not be suitable for everyone, especially those with existing heart problems or heart disease. It is always advisable to consult a doctor to determine the appropriate types and intensity of physical activities.
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Frequently asked questions
Cardiac muscle is only found in the heart.
Cardiac muscle is a specialised, involuntary type of muscle tissue that is responsible for keeping the heart pumping and blood circulating around the body.
Cardiac muscle is also called myocardium or heart muscle.
