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Grade 12Botany

Which is the correct sequence of the components of a reflex arc?
A
Receptors - Muscle - Sensory neuron - Motor neuron - Spinal cord
B
Receptors - Motor neuron - Spinal cord - Sensory neuron - Muscle
C
Receptors - Spinal cord - Sensory neuron - Motor neuron- Muscle
D
Receptors - Sensory neuron - Spinal cord - Motor neuron - Muscle

Profile image of Ankit Singh
5 Years agoGrade 12
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2 Answers

Profile image of Rituraj Tiwari
5 Years ago
When a receptor is stimulated, it sends a signal to the central nervous system, where the brain coordinates the response. But sometimes a very quick response is needed, one that does not need the involvement of the brain. This is called as the reflex action. In a simple reflex action:
Stimulus -> Receptor -> Sensory neuron -> Relay Neuron -> Motor neuron -> Effector (Muscle).
So, the correct answer is 'Receptors - Sensory neuron - Spinal cord - Motor neuron - Muscle
Profile image of Mayank Ranka
5 Years ago
When a receptor is stimulated, it sends a signal to the central nervous system, where the brain coordinates the response. But sometimes a very quick response is needed, one that does not need the involvement of the brain. This is called as the reflex action. In a simple reflex action:
Stimulus -> Receptor -> Sensory neuron -> Relay Neuron -> Motor neuron -> Effector (Muscle).
So, the correct answer is 'Receptors - Sensory neuron - Spinal cord - Motor neuron - Muscle

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