Refer to the Figure Shown

question 14

Multiple Choice

Refer to the figure shown.
Arrow I in the diagram points to

• A) preproinsulin.
• B) proinsulin.
• C) the P segment.
• D) insulin.

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Definitions:

T Tubule

T Tubules, or transverse tubules, are extensions of the cell membrane that penetrate into the center of skeletal and cardiac muscle cells, playing a crucial role in muscle contraction.

Sliding Filament Model

A theory describing the mechanism of muscle contraction, where actin and myosin filaments slide past each other to shorten the muscle fiber length.

Sarcomere

The basic unit of a muscle's cross-striated myofibril, responsible for the muscle's contractile properties.

Actin

A protein that forms filaments and is involved in various types of cell movement and structure, including muscle contraction and cell division.