Multiple Choice
The sequence of electrical changes that occurs along the sarcolemma when a muscle fiber is stimulated is known as the __________.
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9. Muscle Tissue
Steps of Muscle Contraction
Multiple Choice
Each skeletal muscle fiber is controlled by a neuron at a single __________.
A
varicosity
B
neuromuscular junction
C
synaptic knob
D
transverse tubule
E
sarcomere
Verified step by step guidance1
Understand the context: Skeletal muscle fibers are controlled by neurons, which communicate with the muscle fibers to initiate contraction.
Identify the key term: The point where a neuron communicates with a muscle fiber is crucial for transmitting signals.
Define the term 'neuromuscular junction': This is the specific site where the motor neuron and muscle fiber meet, allowing for the transmission of nerve impulses to the muscle.
Differentiate between the options: A 'varicosity' is related to autonomic nervous system and smooth muscle, not skeletal muscle. A 'synaptic knob' is part of the neuron but not the specific site of communication with muscle fibers. A 'transverse tubule' is involved in conducting electrical signals within the muscle fiber, not the site of neuron-muscle communication. A 'sarcomere' is the functional unit of muscle contraction, not the site of neural control.
Conclude with the correct term: The 'neuromuscular junction' is the correct term for the site where a neuron controls a skeletal muscle fiber.
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