Arrange following components in correct sequence with respect to knee jerk reflex.

          A)     Efferent pathway

          B)     Muscle spindle

          C)     Afferent pathway

          D)     Motor end plate

The correct sequence for the knee jerk reflex is as follows:

B) Muscle spindle: The muscle spindle detects changes in muscle length and initiates the reflex response.

C) Afferent pathway: Sensory signals from the muscle spindle travel through the afferent (sensory) pathway to the spinal cord.

A) Efferent pathway: Within the spinal cord, the sensory signals are processed, and motor signals are generated. These motor signals travel through the efferent (motor) pathway.

D) Motor end plate: The motor signals are transmitted from the spinal cord to the motor end plates, which are specialized regions on muscle fibers. This triggers the contraction of the muscle.

So, the correct sequence is: B) Muscle spindle → C) Afferent pathway → A) Efferent pathway → D) Motor end plate.