The sudden constriction of the pupil when bright light falls on the eye is an example of
Correct answer: A. a reflex action
- A. a reflex action
- B. a conditioned response
- C. a voluntary movement
- D. a hormonal effect
Explanation
The pupil reflex is automatic, rapid and involuntary, integrated in the brain stem, meeting every criterion of a reflex. It happens even in sleep, which shows that no conscious control or learning is involved.
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About Receptors
Receptors are specialized cells or proteins that detect stimuli such as light, sound, pressure, temperature and chemicals, then initiate responses through sensory or hormonal pathways. Questions distinguish sensory receptors from effectors, compare receptor types, and examine stimulus conversion into nerve impulses, including the roles of rods, cones, chemoreceptors and mechanoreceptors.
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