[Answer] 6. We'll skip Q and go to R. What is a 'knee-jerk'?

Step 1 : Introduction to the question "6. We'll skip Q and go to R. What is a 'knee-jerk'?"

...1. Reactive synaptogenesis 2. Receptor 3. Reflex 4. Rhodopsin A reflex is simply a reflected action or movement. It is an involuntary action following immediately upon some stimulus, as in withdrawal of a limb from pain. Receptors are the nerve endings of all sensory and autonomic neurones that receive stimuli for transmission. Rhodopsin is the light-sensitive photochemical found in the rods in the retina. Aging can result in a decline in mental function. Reactive synaptogenesis is the compensatory sprouting of dendrites by remaining neurones to maintain the total number of synaptic connections in the brain.

Step 2 : Answer to the question "6. We'll skip Q and go to R. What is a 'knee-jerk'?"

Reflex:

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