Multiple Choice
Which of the following best describes the sequence of ion movements during the depolarization phase of an action potential in a neuron?
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45. Nervous System
Neurons and Action Potentials
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The neurons from the left primary motor cortex control the skeletal muscles on the:
A
lower half of the body only
B
both sides of the body equally
C
right side of the body
D
left side of the body
Verified step by step guidance1
Understand the concept of motor cortex function: The primary motor cortex is responsible for voluntary movement control. It is located in the frontal lobe of the brain and sends signals to skeletal muscles via motor neurons.
Learn about the contralateral control of the body: The primary motor cortex on one side of the brain controls the opposite side of the body. This is due to the crossing of motor pathways (decussation) in the medulla oblongata.
Identify the specific question: The problem asks which side of the body is controlled by the neurons from the left primary motor cortex.
Apply the concept of contralateral control: Since the left primary motor cortex controls the opposite side of the body, it will control the skeletal muscles on the right side of the body.
Review the options provided: Compare the explanation to the options given in the problem and confirm that the correct answer aligns with the concept of contralateral control.
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