Multiple choice

_______ is the contractile element of a muscle fibre composed of thick and thin filaments.

  1. Neuron

  2. Myofibril

  3. Mast cell

  4. Sarcolemma
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Myofibrils are the rod-like contractile elements within muscle fibers, composed of overlapping thick (myosin) and thin (actin) filaments. These filaments slide past each other during muscle contraction. Neurons transmit nerve signals, mast cells are involved in immune response, and sarcolemma is the muscle cell membrane.

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