Multiple Choice
In a skeletal muscle fiber, which structure would you expect to have the greatest total surface area?
9. Muscle Tissue
Steps of Muscle Contraction
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The space between the axon terminus of the neuron and the sarcolemma of the muscle fiber is the __________.
A
synaptic knob
B
motor unit
C
M line
D
motor end plate
E
synaptic cleft
Verified step by step guidance1
Understand the context: The problem is asking about the specific anatomical space involved in neuromuscular communication.
Identify the components: The axon terminus of the neuron is where the nerve signal is transmitted, and the sarcolemma is the cell membrane of a muscle fiber.
Recognize the role of the synaptic cleft: This is the gap between the axon terminus and the sarcolemma where neurotransmitters are released to propagate the signal.
Differentiate from other terms: The synaptic knob is the end of the neuron, the motor unit is a neuron and the muscle fibers it controls, the M line is part of the sarcomere structure, and the motor end plate is the specialized region of the sarcolemma.
Conclude that the space in question is the synaptic cleft, which is crucial for the transmission of nerve impulses to muscle fibers.
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