An involuntary and nearly instantaneous movement in response to a stimulus is called:
Correct answer: A. Reflex
- A. Reflex
- B. Reflex arc
- C. Neuron
- D. Synapse
Explanation
A reflex action is an automatic, involuntary, and rapid response to a stimulus, so this is the correct answer. A reflex is an automatic, involuntary, and rapid response to a stimulus that protects an organism from harm and aids survival. These responses occur through a reflex arc, a nerve pathway that bypasses the brain for instant reaction, though the signal is still sent to the brain for further processing or override. Examples include the sudden withdrawal from a hot surface, the pupil constricting in bright light, and the knee-jerk response to a tap.
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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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