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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Home > Muscular System > Muscles of the Arm and Hand > Muscle Cell Types. Muscle tissue, one of the four major tissue types, plays the vital role of providing movement and heat generation to the organs of the body. Within muscle tissue are three distinct groups of tissues: skeletal muscle, cardiac muscle, and smooth muscle. Each of these tissue groups is made of specialized cells that give the tissue its unique properties. Skeletal muscle is the most common and widely distributed muscle tissue in the body, making up around 40% of the body’s total mass.
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In the diagram, the neurotransmitter, acetylcholine, is released from this area. To stimulate skeletal muscle contraction, acetylcholine must cross the _____ of the neuromuscular junction and bind to receptors on the motor endplate.
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Myosin and actin fibers are arranged similarly in skeletal and cardiac muscle; however, in smooth muscle the arrangement of myosin is scattered and actin fibers are loosely linked and incorporate the use of dense bodies. 71. The layer of connective tissue that surrounds an individual muscle fiber is called the ______.
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Cardiac muscle cells or cardiomyocytes (also known as myocardiocytes or cardiac myocytes) are the muscle cells (myocytes) that make up the cardiac muscle. Each myocardial cell contains myofibrils, which are specialized organelles consisting of long chains of sarcomeres, the fundamental contractile units of muscle cells.
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This structure is unique to cardiac muscle cells, and allows individual cells to be firmly attached to each other (to provide mechanical strength during contraction), and also allow the action potential to spread rapidly through the cardiac muscle tissue, so that contractions are smooth and coordinated.
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When Ca2+ binds to a myosin head, it triggers the formation of a cross-bridge between myosin and actin. 52. In __________ contraction, the peak tension developed is less than the resistance, and the muscle elongates as a result of the contraction of another muscle or the pull of gravity.
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Myocardial infarction[edit] Myocardial infarction, commonly known as a heart attack, occurs when the heart's supplementary blood vessels are obstructed by an unstable build-up of white blood cells, cholesterol, and fat. With no blood flow, the cells die, causing whole portions of cardiac tissue to die.
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Structure[edit] There are two types of cells within the heart: the cardiomyocytes and the cardiac pacemaker cells. Cardiomyocytes make up the atria (the chambers in which blood enters the heart) and the ventricles (the chambers where blood is collected and pumped out of the heart).
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A) motor units with the longest muscle fibers. B) many small motor units with the ability to stimulate other motor units. C) large motor units with small, highly excitable neurons. D) motor units with larger, less excitable neurons.
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which of the following is unique to cardiac muscle cells?
The heart is unique to cardiac muscle cells.