Which Statement About the Microscopic Anatomy of Skeletal Muscle Fibers

question 21

Multiple Choice

Which statement about the microscopic anatomy of skeletal muscle fibers is true?

• A)Tubular extensions of the sarcolemma penetrate the fiber transversely.
• B)Cross striations result from the lateral alignment of thick and thin filaments.
• C)Each fiber has many nuclei.
• D)Muscle fibers are continuous from tendon to tendon.
• E)All of the answers are correct.

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Definitions:

Lethargy

A state of sluggishness, drowsiness, or lack of energy, which can be a symptom of various conditions.

Neurotransmitters

Chemical substances that transmit signals across a synapse from one neuron to another in the brain and nervous system.

Serotonin

A neurotransmitter that contributes to feelings of well-being and happiness, also involved in regulating mood, appetite, and sleep among other physiological processes.

Norepinephrine

A neurotransmitter and hormone involved in the body's fight or flight response, playing a key role in attention and responding actions in the brain.