Question

The direction of 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

The nervous system is a complex part of an animal. The nervous system transmits signals to and from different regions of the body to coordinate its sensory signals.

Complete answer: A reflex action can be defined as an almost instantaneous and involuntary movement in response to a stimulus that does not involve a conscious thought process. Mechanoreceptors which are also known as touch receptors found in the skin, chemoreceptors that are present within the body, or light receptors located within the eye can detect a stimulus that in turn evokes a reflex response. The neural pathways are the anatomical pathways of a reflex and are known as the reflex arc. These pathways are equipped with an afferent nerve, efferent nerve, and generally one or more interneurons present in the central nervous system. Withdrawal reflex is a polysynaptic reflex that causes the stimulation of motor, association, and sensory neurons. This reflex is intended to protect the body from damaging stimuli. For instance, when someone touches a hot object, their first response is to withdraw their hand away from the object instantaneously. This is generated due to the sensory impulse being triggered by the danger receptors present in the skin. The sensory impulses are transmitted to the central nervous system to initiate the reflex.
Hence, the correct answer is Option D

Note: The pupillary light reflex is considered to be one of the best-known reflexes. The pupils of the eyes contract when a light is flashed near or on one eye. Here, the light is the stimulus, the optic nerve in the eye transmits the impulses to the brain, then the autonomic nerves convey the response to the pupillary musculature.