All of the following are reflex actions EXCEPT:
Correct answer: B. Swallowing of the bolus
- A. Change in the size of the pupil in response to light
- B. Swallowing of the bolus
- C. Sudden jerky withdrawal of hand when pricked
- D. Knees jerk in response to a blow
Explanation
Reflex actions are involuntary and instantaneous responses to stimuli. The change in pupil size, jerky withdrawal of the hand, and knee jerk are all reflex actions because they occur automatically and without conscious thought. However, swallowing of the bolus, while it begins with a reflexive component, is primarily a voluntary action because it requires conscious control, especially after the initial trigger, making it not purely reflexive.
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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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