________ cells enable the immune system to respond quickly and robustly if the same antigen is encountered a second time.
A) Secondary
B) Primary
C) Memory
D) Responder
E) Transponder
Question 2
In motor pathways, the only portion of the pathway that is outside of the CNS is the
A) lower motor neuron.
B) upper motor neuron.
C) axon of the lower motor neuron.
D) axon of the upper motor neuron.
E) interneuron.