If the receptor in a reflex arc is working but the motor nerve is damaged what is the most likely result?
Answer and explanation
Correct answer: Stimulus will be detected but command will not properly reach the effector
A reflex arc contains a receptor, sensory pathway, integration centre, motor pathway and effector. Because the receptor is functioning, the stimulus can still be detected and the sensory message can enter the pathway. However, damage to the motor nerve interrupts transmission from the control centre to the muscle or gland, so the response becomes weak or absent. Therefore A is correct; B ignores the working receptor and C and D are unrelated.
Frequently asked questions
What is the correct answer to this question?
Stimulus will be detected but command will not properly reach the effector
Why is this the correct answer?
A reflex arc contains a receptor, sensory pathway, integration centre, motor pathway and effector. Because the receptor is functioning, the stimulus can still be detected and the sensory message can enter the pathway. However, damage to the motor nerve interrupts transmission from the control centre to the muscle or gland, so the response becomes weak or absent. Therefore A is correct; B ignores the working receptor and C and D are unrelated.
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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