Barbiturates

question 488

Multiple Choice

Barbiturates:

• A) interfere with REM sleep.
• B) are a class of powerful hallucinatory drugs.
• C) stimulate regions at the base of the brain and enhance alertness.
• D) are derived from opium.

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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.