BLOOD CARDIOVASCULAR SYSTEM LYMPHOID ORGANS
CARDIOVASCULAR SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The fibers lie in the epicardium.
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The fiber has lower density of myofibrils.
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It does not contain intercalated disk.
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It is similar with cardiac muscle.
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Detailed explanation-1: -In general, Purkinje cells are larger than myocardial cells and are distinguishable histologically. Purkinje cells lack transverse tubules that are present in myocardial cells. Because of their primary role in rapid conduction of the electrical impulse, Purkinje cells have fewer myofibrils than myocardial cells.
Detailed explanation-2: -The Purkinje fibers are specialized conducting fibers composed of electrically excitable cells. They are larger than cardiomyocytes with fewer myofibrils and many mitochondria. They conduct cardiac action potentials more quickly and efficiently than any of the other cells in the heart’s electrical conduction system.
Detailed explanation-3: -The purkinje fibres are found in the sub-endocardium. They are larger than cardiac muscle cells, but have fewer myofibrils, lots of glycogen and mitochondria, and no T-tubules.
Detailed explanation-4: -So, the correct option is ‘True’.