9
lesson pretestMultiple Choice

Pretest

Question 9 • Biology

Which statement best describes the central nervous system?

Answer
A
It senses stimuli and carries out a reaction.
B
It is made up of all nerve cells.
C
It secretes hormones.
D
It is made up of the brain and the spinal cord.

Explanation

The central nervous system consists of the brain and spinal cord. These structures receive and process information and help coordinate responses; sensing stimuli and carrying out a reaction describes a broader function of the nervous system, not what the central nervous system is made up of.

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