PHYSIOLOGY
SYNAPTIC PHYSIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Fascicles
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Perimysium
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Sarcomere
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Fascia
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Detailed explanation-1: -These myofibrils are surrounded by the muscle cell membrane (sarcolemma), which form deep invaginations called transverse tubules (T-tubules) within the myofibril. Each myofibril contains contractile proteins, described as thick and thin filaments, which are arranged longitudinally into units called sarcomeres.
Detailed explanation-2: -The Sarcomere: The Basic Contractile Unit of Muscle Each sarcomere is composed of two main protein filaments-actin and myosin-which are the active structures responsible for muscular contraction.
Detailed explanation-3: -From each Z-line to the next is a unit called the sarcomere. The sarcomere is the smallest contractile unit in the myofibril. Sarcomeres contract because the Z-lines move closer together. As the sarcomeres contract the myofibrils contract. As the myofibrils contract the muscle cell contracts.