Attached is the image corresponding to this question.
There are choices for this question namely:
reflex arc
knee
somatic nervous system
knee j*rk reaction
The correct answer is "knee j*rk reaction". The knee j*rk reaction is a type of reflex wherein nerve impulses from the muscle does not have to reach the brain for the appropriate motor response of the body. Reflexes are important as to shorten the response time especially in times when a long response time will harm the body.
Brainly recognizes the word "j*rk" as inappropriate. Sorry about that.
