Question

Put the following statements in order?

a. Impulse travels from brain down spinal cord

b. Sensory neuron receives input

c. Brain processes signal

d. Afferent neuron sends information to interneuron

e. Message travels down effector neuron to target

f. PNS transfers signal to CNS

g. Impulse travels up spinal cord to brain

Answer 1

Hmm.. Not completely sure, but I'll give it a go:

b/f/d/g/c/a/e or b/d/f/g/c/a/e...

Explanation:

every signal must start somewehere, so:

b. Sensory neuron receives input

Not so sure about f/d or d/f, because interneurons are found in the spinal chord, which is part of the CNS (Central Nervous System)
Afferent Neurons are sensory neurons, so I would think that basically d and f happen at the same time....

f. PNS transfers signal to CNS
d. Afferent neuron sends information to interneuron

Once received by the Interneuron, the signal travels up the spine (via the Thalamus) to the brain:
g. Impulse travels up spinal cord to brain

Where the information is processed and action is taken::

c. Brain processes signal
a. Impulse travels from brain down spinal cord
e. Message travels down effector neuron to target

Reflecting on the above, it probably is f/d...