Nervous SystemATI TEAS 7 cheat sheet

Control and signaling

8 key facts 5 practice questions Reviewed Oct 2026

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Divisions

CNS = brain + spinal cord
PNS = all nerves outside the CNS
PNS splits into somatic (voluntary) and autonomic (involuntary)

Autonomic

Sympathetic — fight or flight: HR up, pupils dilate, digestion down
Parasympathetic — rest and digest: HR down, digestion up

The Neuron

Dendrites receive, axon transmits, myelin speeds conduction
The gap between neurons is the synapse

Reflexes

A reflex arc routes through the spinal cord, not the brain — which is why it is fast

Key takeaway

Control and signaling

Before you read

Test yourself first: 5 questions

Question 1 of 5

Which best describes the function of the nervous system?

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