Multiple Choice
What causes the striated appearance of skeletal muscle fibers?
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9. Muscle Tissue
Structure of a Skeletal Muscle
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What is the functional contractile unit of the myofibril?
A
Myofibril
B
T-tubule
C
Sarcomere
D
Myofilament
Verified step by step guidance1
Understand that the myofibril is a basic rod-like unit of a muscle cell, composed of repeating sections called sarcomeres.
Recognize that the sarcomere is the smallest functional contractile unit within the myofibril, responsible for muscle contraction.
Identify the components of a sarcomere, which include actin (thin filaments) and myosin (thick filaments), along with other proteins that regulate contraction.
Learn how the sliding filament theory explains muscle contraction, where actin and myosin filaments slide past each other, shortening the sarcomere.
Note that T-tubules are involved in transmitting the action potential to the sarcomeres, but they are not the contractile units themselves.
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