Question

The direction of against stimulus response is opposite in which of the following reflex action?
a. Biceps tendon reflex
b. Knee jerk reflex
c. Triceps tendon reflex
d. Withdrawal reflex

Answer 1

Hint: A reflex is an involuntary response to stimulus. It is made possible by neural pathways called reflex arcs. These reflex arcs which can act on an impulse before the impulse reaches the brain. Reflex action has various functions which will be discussed below.

Complete answer:
A reflex action is an involuntary response to stimulus which is made possible by neural pathways called reflex arcs. Reflex action has various functions include
• Maintaining homeostasis of the body
• Automatic actions
• Balance and posture
• Maintaining the movement of eyes
Some classic examples of reflex action include contraction of pupil in bright light, sudden removal of hands from sharp objects or hot objects.

According to the question, the direction of against stimulus response is opposite in withdrawal reflex. It is a spinal reflex which intends to protect a body from damaging stimuli. It is mediated by a polysynaptic reflex which results in stimulation of motor neurons in order to give a quick response. Withdrawal reflex is a type of monosynaptic reflex and is mediated by the reflex arc. Examples of withdrawal reflex, when someone touches a hot object, he/she withdraws their hand, the heat stimulates temperature and pain receptors in the skin triggering the person to withdraw the hand.

Hence, the correct answer is option (D).

Note: Reflex arc is a specific nerve impulse pathway. There are five components of the reflex arc which include receptors, sensory neurons, integrating center, motor neurons, and effector. It is a one way conduction with subliminal fringe.