Answer to Question #129214 in Biology for venkat

Question #129214
1.what is mean by reflex arc?

2.what components are involved in reflex arc?

3.Write the path way of reflex arc?

4.what is mean by knee jerk reflex?

5.The existence of the knee jerk was first noted in which year?
Expert's answer

1. A reflex arc is a neural pathway consisting of neurons and their fibers that regulate a reflex - specific response to a certain stimulus.

2. The reflex arc consists of sensory neurons, motor neurons, interneurons, and their fibers - axons and dendrites.

3. The pathway of the reflex arc: receptor in the skin or other organ, afferent nerve fiber traveling from the organ to the spinal cord or the brainstem, an integrating center (a grey matter of spinal cord or brainstem containing the body of sensitive neurons), efferent nerve fibers (motor neuron fibers), effector (muscle or other target organ carrying the response) to a stimulus).

4. Knee jerk reflex is a tendon reflex that leads to a sudden kicking movement of the lower leg in response to a tap on the patellar tendon.

5. The knee jerk reflex was first noted in 1875.

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