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Nervous System Basics

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Questions and Answers

What is the main function of the myelin sheath?

To electrically insulate neurons from one another (correct)
To provide a framework for migrating neurons
To produce a chemical growth factor
To transmit electrical impulses

What type of cells are responsible for forming the myelin sheath in the peripheral nervous system?

Oligodendrocytes
Schwann cells (correct)
Microglia
Astrocytes

What is the name of the spaces between adjacent Schwann cells or segments of the myelin sheath?

Nodes of Ranvier (correct)
Neurofibril nodes
Myelin sheath gaps
Neurolemma

What is the result of severing the spinal cord?

Permanent loss of function (B) Signup and view all the answers

What is the function of microglia in the central nervous system?

To phagocytize cellular debris, damaged cells, and pathogens (A) Signup and view all the answers

What is the role of astrocytes in the embryo?

To provide a framework for migrating neurons (D) Signup and view all the answers

What is the primary function of the nervous system?

To maintain homeostasis and respond to the environment (D) Signup and view all the answers

What are the two main divisions of the nervous system?

Central and peripheral nervous systems (A) Signup and view all the answers

What is the autonomic nervous system (ANS) part of?

Peripheral nervous system (PNS) (B) Signup and view all the answers

What is the function of dendrites in a neuron?

To transmit impulses toward the cell body (B) Signup and view all the answers

What is the function of the axon in a neuron?

To transmit impulses away from the cell body (D) Signup and view all the answers

Where are neuron cell bodies typically located?

In the central nervous system or close to it in the trunk of the body (B) Signup and view all the answers