PHYSIOLOGY
DIFFERENT TYPE AND STRUCTURE OF MUSCLE FIBERS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Double membrane organelle with its own circular DNA
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Network of tubes
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Membrane containing DNA
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Phospholipid bilayer made of phospholipids
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Detailed explanation-1: -T-tubules within the heart are closely associated with the intracellular calcium store known as the sarcoplasmic reticulum in specific regions referred to as terminal cisternae. The association of the T-tubule with a terminal cistern is known as a diad.
Detailed explanation-2: -The sarcoplasmic reticulum of skeletal muscle cells is a highly ordered structure consisting of an intricate network of tubules and cisternae specialized for regulating Ca2+ homeostasis in the context of muscle contraction.
Detailed explanation-3: -As the T-tubules encircle the myofibrils they interrupt the longitudinal channels of the sarcoplasmic reticulum. At these points of contact the sarcoplasmic reticulum is somewhat dilated to form lateral sacs (or terminal cisterns); neighbouring sacs are connected together.