A person can feel touch but cannot move the hand away after touch. Which conclusion is more scientific?
Answer and explanation
Correct answer: Sensory pathway may be normal but motor pathway or muscle may be affected
Feeling touch demonstrates that the touch receptor and at least much of the sensory pathway are functioning. Moving the hand away requires processing followed by a motor command travelling through motor nerves to an effector muscle. If sensation is present but movement fails, the defect may therefore lie in the motor pathway, neuromuscular connection or muscle. Option A is appropriately cautious; B contradicts the evidence and C and D are irrelevant.
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What is the correct answer to this question?
Sensory pathway may be normal but motor pathway or muscle may be affected
Why is this the correct answer?
Feeling touch demonstrates that the touch receptor and at least much of the sensory pathway are functioning. Moving the hand away requires processing followed by a motor command travelling through motor nerves to an effector muscle. If sensation is present but movement fails, the defect may therefore lie in the motor pathway, neuromuscular connection or muscle. Option A is appropriately cautious; B contradicts the evidence and C and D are irrelevant.
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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