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Control and Coordination — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceControl and Coordination1 Mark
MCQ
Which is the correct sequence of the components of a reflex arc ?
  • A
    Receptors $\rightarrow $ Muscles $\rightarrow $ Sensory neuron $\rightarrow $ Motor neuron $\rightarrow $ Spinal cord.
  • B
    Receptors $\rightarrow $ Motor neuron $\rightarrow $ Spinal cord $\rightarrow $ Sensory neuron $\rightarrow $ Muscle.
  • C
    Receptors $\rightarrow $ Spinal cord $\rightarrow $ Sensory neuron $\rightarrow $ Motor neuron $\rightarrow $ Muscle.
  • ✓
    Receptors $\rightarrow $ Sensory neuron $\rightarrow $ Spinal cord $\rightarrow $ Motor neuron $\rightarrow $ Muscle.
✓

Answer

Correct option: D.
Receptors $\rightarrow $ Sensory neuron $\rightarrow $ Spinal cord $\rightarrow $ Motor neuron $\rightarrow $ Muscle.
A stimulus received by the receptors present on skin, is transmitted to the sensory neuron which carries it to the central nervous system $($the spinal cord and brain$).$ A motor neuron carries the message from the central nervous system to the effector which could be a muscle, a gland or both.

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