18
QuizMultiple Choice

The Brain and Spinal Cord — Unit test

Question 18 • GA-Essentials of Healthcare

What is true about all neurons?

Answer
A
They are bundled together in nerves that are surrounded by a protective sheath.
B
They all transmit signals through axons and receive neurotransmitters through dendrites.
C
They each bring nutrients to the brain and produce a fatty protective layer called myelin.
D
They all send signals from the brain to the body through long axons in the vertebral column.

Explanation

Neurons typically receive signals through dendrites and transmit signals away from the cell body along an axon. Choice B describes these basic parts and their roles. The other choices describe features that are not true of every neuron: neurons are not all bundled into nerves, most neurons do not make myelin, and neurons carry signals in many directions rather than only from the brain to the body.

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