A person can feel touch but has difficulty lifting the hand. Which part of the nerve pathway may be more affected?
Answer and explanation
Correct answer: Motor nerve or effector
Feeling touch indicates that the skin receptor and sensory pathway can detect the stimulus and carry information toward the central nervous system. Lifting the hand, however, requires a motor command to travel from the nervous system through a motor nerve to the muscles, which act as effectors. Difficulty in movement therefore points to the motor nerve or effector, making option B correct. The sensory and skin receptor choices would better explain loss of sensation, not weakness of movement.
Frequently asked questions
What is the correct answer to this question?
Motor nerve or effector
Why is this the correct answer?
Feeling touch indicates that the skin receptor and sensory pathway can detect the stimulus and carry information toward the central nervous system. Lifting the hand, however, requires a motor command to travel from the nervous system through a motor nerve to the muscles, which act as effectors. Difficulty in movement therefore points to the motor nerve or effector, making option B correct. The sensory and skin receptor choices would better explain loss of sensation, not weakness of movement.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Control and Coordination.
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