Fill in the blank:  A knee-jerk reflex employs only _______________________ and motor neurons.

Background:  A doctor conducted a patellar tendon (aka knee jerk - covered in lecture, assigned reading, and laboratory) reflex test on a patient. To do so, she tested the patient's knee-jerk reflex by hitting the patient's patellar tendon with a rubber hammer.For this patient, the doctor observed that hitting the tendon caused no knee jerk reflex at all, even after many attempts.Normally, a patient will kick her lower leg after the hammer hit on the tendon.However, the doctor could stimulate contraction of the quadriceps leg muscles using a stimulating electrode that applied a voltage across the muscle. The doctor, with further analysis, determined that the receptor membranes of the stretch receptors were operating correctly.To do this, she carefully inserted an electrode into a stretch receptor's membrane, near to the location on the membrane where receptor  proteins are located. She measured a change in voltage while hitting the tendon with the hammer. With further testing, the…

Write the names of the numbered structures on the corresponding lines shown on the image below and add large arrows to the the diagram displaying the direction the nerve impulse will travel from dendrites to the muscle

Testing the patellar reflex in a patient is a good indicator of overall brain function. True or false