Which of the following describes the comprehensive pathway of reflex arc?
Correct answer: B. Prick on finger → Sensory nerve → Spinal cord → Motor nerve → Finger muscles
- A. Prick on finger → Sensory nerve → Medulla → Motor nerve → Arm Muscle
- B. Prick on finger → Sensory nerve → Spinal cord → Motor nerve → Finger muscles
- C. Prick on finger → Sensory nerve → Cerebrum → Motor nerve → Finger muscles
- D. Prick on finger → Sensory nerve → Cerebellum → Motor nerve → Finger muscles
Explanation
The simplest arrangement of a reflex are consists of the receptors, an interneuron, and an effector; together these units from a finctional reflex group. Brain is, however, excluded in the reflex arc. Medulla, Cerebrum and Cerebellum are parts of the brain.
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About Coordination and Control
Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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