Direction of reflex action is from:
Correct answer: B. Receptor to sensory neuron to associative neuron and then through motor neurons to effector
- A. Receptor to sensory neuron to motor neuron and then through associative neurons to effect
- B. Receptor to sensory neuron to associative neuron and then through motor neurons to effector
- C. Effector to sensory neuron to associative neuron and then through motor neurons to Receptor
- D. Effector to sensory neuron to motor neuron and then through associative neurons to Receptor
Explanation
A receptor in the skin detects a stimulus (the change in temperature). A sensory neuron sends electrical impulses to a relay neuron, which is located in the spinal cord of the CNS. Relay neurons connect sensory neurons to motor neurons. Motor neurons send electrical impulses to an effector. The effector produces a response (the muscle contracts to move the hand away).
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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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