All of the following are examples of Reflex Action EXCEPT
Correct answer: D. Picking pen to write name
- A. Blinking of eyelids in bright light
- B. Pulling hand away from hot object
- C. Sneezing on tickling nose
- D. Picking pen to write name
Explanation
Reflex actions are involuntary responses to stimuli that occur rapidly and without conscious thought. Let's analyze each option:A) Picking pen to write name: This is not a reflex action but a voluntary movement. The act of picking up a pen to write involves a conscious decision and control over muscle movements.B) Sneezing on tickling nose: Sneezing in response to tickling of the nose is a reflex action. The stimulus of tickling triggers the body's reflex arc, leading to a sudden expulsion of air to clear the nasal passages.C) Pulling hand away from hot object: This is a reflex action known as the withdrawal reflex. When the hand comes into contact with a hot object, sensory receptors in the skin send signals to the spinal cord, which immediately activates motor neurons to withdraw the hand from the source of heat, preventing injury.D) Blinking of eyelids in bright light: Blinking in response to bright light is a reflex action. The sudden exposure to light stimulates sensory receptors in the retina, which send signals to the brainstem to initiate the reflexive closure of the eyelids to protect the eyes from potential damage.In summary, options B, C, and D are examples of reflex actions, while option A involves voluntary movement. Therefore, the correct answer is A) Picking pen to write name.
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About Reflexes and the Reflex Arc
A reflex arc shows how a rapid, automatic response travels from a receptor through a sensory neuron, relay neuron and motor neuron to an effector. The topic covers synapses, the spinal cord's role, and the difference between an involuntary reflex action and a slower voluntary response.
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