26th November 2019

livestrong

17

What are the characteristics of the cardiac muscle?

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Cardiac muscle is specialized tissue that is found only in the heart. It has characteristics similar to both smooth and skeletal muscle tissue, as well as specialized properties, that allow it to function with fast but sustained contractions, rapid conduction and coordinated movement.

What is the function of the cardiac muscle cell?

Cardiac muscle cells or cardiomyocytes (also known as myocardiocytes or cardiac myocytes) are the muscle cells (myocytes) that make up the cardiac muscle (heart muscle). Unlike multinucleated skeletal cells, the majority of cardiomyocytes contain only one nucleus, although they may have as many as four.

What is unique to cardiac muscle cells?

Like skeletal muscle, cardiac muscle cells are striated due to a similar arrangement of contractile proteins. Unique to the cardiac muscle are a branching morphology and the presence of intercalated discs found between muscle fibers. They are often seen as zigzagging bands cutting across the muscle fibers.

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What is the function of cardiac muscle tissue?

Cardiac Muscle Tissue. Cardiac muscle tissue is an extremely specialized form of muscle tissue that has evolved to pump blood throughout the body. In fact, cardiac muscle is only found in the heart and makes up the bulk of the heart's mass.

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What are the function of human heart?

As the heart contracts, it pumps blood around the body. It carries deoxygenated blood to the lungs where it loads up with oxygen and unloads carbon dioxide, a waste product of metabolism. The heart, blood, and blood vessels combined are referred to as the circulatory system.

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What are three characteristics of cardiac muscle tissue?

Cardiac muscle is specialized tissue that is found only in the heart. It has characteristics similar to both smooth and skeletal muscle tissue, as well as specialized properties, that allow it to function with fast but sustained contractions, rapid conduction and coordinated movement.

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What is the function of the cardiac muscle cells?

Contraction. The heart's main function is to pump oxygen-rich blood throughout the body to provide cells with vital nutrients. In order to do this, the cardiac cells must contract. In fact, the American Heart Association reports that the average adult heart contracts 100,000 times a day.

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What are the characteristics of cardiac cells?

Properties of Cardiac Cells. The muscle cells of the heart are unique and responsible for the electrical stimulation that leads to proper mechanical function. Myocardial cells have several different electrophysiologic properties: automaticity, excitability, conductivity, contractility, rhythmicity, and refractoriness.

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What is the function of the myocardium in the heart?

The myocardium is the middle muscular layer of the heart's walls and it functions by providing a scaffolding for the heart chambers, assisting in contraction and relaxation of the cardiac walls so that blood can pass between the chambers and electrostimulation conduction through its own tissues and into the epicardium.

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What are the characteristics of cardiac muscle cells?

Cardiac muscle cells are found only in the heart, and are specialized to pump blood powerfully and efficiently throughout our entire lifetime. Four characteristics define cardiac muscle tissue cells: they are involuntary and intrinsically controlled, striated, branched, and single nucleated.

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What is the function of cardiac muscle?

Cardiac muscle (heart muscle) is one of the three major types of muscle, the others being skeletal and smooth muscle. It is an involuntary, striated muscle that is found in the walls of the heart.

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What are the special features of cardiac muscle?

Three features of cardiac muscles are: → Cardiac muscles are involuntary muscles that contract rapidly, but do not get fatigued. → The cells of cardiac muscles are cylindrical, branched, and uninucleate. → They control the contraction and relaxation of the heart.

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What is the function of the heart?

The human heart is an organ that pumps blood throughout the body via the circulatory system, supplying oxygen and nutrients to the tissues and removing carbon dioxide and other wastes.

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What is the structure of cardiac muscle cells?

Although it is striated, cardiac muscle differs from skeletal muscle in that it is highly branched with cells connected by overlapping projections of the sarcolemma called intercalated discs.

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What does the cardiac muscles do?

The muscle that makes up the heart is called cardiac muscle. It is also known as the myocardium (say: my-uh-KAR-dee-um). The thick muscles of the heart contract to pump blood out and then relax to let blood back in after it has circulated through the body.

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Are cardiac muscles voluntary?

This voluntary contraction begins with a thought process. A signal from your brain tells your muscles to contract or relax. Unlike skeletal muscle, smooth muscle can never be under your control. Cardiac muscle is also an involuntary muscle, found only in the heart.

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What is the histology of the cardiac muscle?

Muscle: Cardiac Muscle. Cardiac muscle is striated, like skeletal muscle, as the actin and myosin are arranged in sarcomeres, just as in skeletal muscle. Cardiac muscle cells usually have a single (central) nucleus. The cells are often branched, and are tightly connected by specialised junctions.

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What is an example of a cardiac muscle?

Skeletal muscle tissue is found in our skeletal muscles; for example, the biceps. Cardiac muscle is found in our heart, and smooth muscle is found in our visceral, or hollow, organs - for example, blood vessels and intestines.

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What is the definition of cardiac muscle tissue?

Cardiac muscle: A type of muscle tissue that is found only in the heart and is distinguishable from the two other forms of muscle, smooth muscle (that moves internal organs, such as the bowels, and vessels, such as the artery walls) and skeletal muscle (that powers joints).

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How is the heart affected by potassium and calcium?

Excess potassium in the extracellular fluids causes the heart to become dilated and flaccid and also slows the heart rate. An excess of calcium ions causes effects almost exactly opposite to those of potassium ions, causing the heart to go toward spastic contraction.

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What are the characteristics of smooth muscle?

Smooth muscle is fundamentally different from skeletal muscle and cardiac muscle in terms of structure, function, regulation of contraction, and excitation-contraction coupling. Smooth muscle cells known as myocytes, have a fusiform shape and, like striated muscle, can tense and relax.

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Is the heart is a muscle?

Muscle is considered tissue which is part of an organ (in this case your heart). Your heart is a muscular organ that pumps blood to your body. Your heart is at the center of your circulatory system. This system consists of a network of blood vessels, such as arteries, veins, and capillaries.

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Is the cardiac muscle Uninucleate?

Cardiac muscle makes up the heart. It is striated and under the control of the autonomic nervous system. Cardiac muscle is comprised of uninucleate branching cells connected together by intercalated discs, visible in the mid and high magnification image (three are labeled on the high magnification view).

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