Which term should be last in the reflex sequence?
Correct answer: C. Effector
- A. Sensory neuron
- B. Motor neuron
- C. Effector
- D. Receptor
Explanation
The effector is the last component in a reflex arc because it is the structure or organ that carries out the response to the stimulus. In a reflex arc, sensory neurons transmit information to the central nervous system, which processes it and sends signals via motor neurons to the effector, triggering the appropriate response. Placing the effector last ensures that the response occurs after the sensory information has been processed and integrated, allowing for a coordinated and timely reaction to the stimulus.
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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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