reflex arc

[Contach]

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7. In a reflex arc

A. the sensory neuron synapses directly with the motor neuron.

E. a minimum of three neurons must participate.
The answer is E... why??
I thought a simple reflex arc like the knee jerk is sensory --> spinal cord where it synapses directly with motor neuron to kick knee out.
this is a 2 neuron process..

 

[doc3232]

That might also go through the interneuron in the spinal cord. Only thing I could think of.

 

[PooyaH]

First the information is taken from the sensory neurons to the interneurons and then to motor neurons! Interneurons would make it three!

 

[Albuterol]

if the question said monosynaptic reflex arc..then it would be only sensory and motor right? should we always include the interneuron unless it specifies monosynaptic? thanks for the help.