Sequence of a reflex action

1. A.
   spinal cord
2. B.
   brain
3. C.
   muscles of the effector organ
4. D.
   bones of the receptor organ

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1. A.
   Receptors in skin $\rightarrow$ Motor neuron $\rightarrow$ Relay neuron $\rightarrow$ Sensory neuron $\rightarrow$ Effector muscle in arm
2. B.
   Receptors in skin $\rightarrow$ Relay neuron $\rightarrow$ Sensory neuron $\rightarrow$ Motor neuron $\rightarrow$ Effector muscle in arm
3. C.
   Receptors in skin $\rightarrow$ Sensory neuron $\rightarrow$ Relay neuron $\rightarrow$ Motor neuron $\rightarrow$ Effector muscle in arm
4. D.
   Receptors in skin $\rightarrow$ Sensory neuron $\rightarrow$ Effector muscle in arm $\rightarrow$ Motor neuron $\rightarrow$ Relay neuron

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1. A.
   Both, Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. B.
   Both, Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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