Shiro Enrolled in Composition 101, a Three-Credit Course

question 3

Multiple Choice

Shiro enrolled in Composition 101, a three-credit course. If this class meets twice a week, how long should Shiro expect each class to last?

• A) 50 to 60 minutes
• B) about 90 minutes
• C) at least two hours
• D) more than two hours

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Definitions:

Transverse Tubules

These are extensions of the cell membrane that penetrate into the center of skeletal and cardiac muscle cells, facilitating the uniform contraction of the muscle.

Sarcolemma

The thin, plasma membrane that envelopes a muscle cell (fiber), playing a critical role in muscle contraction.

Z Lines

Positions within muscle fibers that mark the boundaries of sarcomeres, playing a critical role in muscle contraction by anchoring actin filaments.

I Bands

The light-appearing regions of a sarcomere in striated muscle fibers, primarily composed of thin actin filaments.