Desiree Is Having Difficulty Sleeping

question 83

Multiple Choice

Desiree is having difficulty sleeping. She has heard of a natural substance that might help her sleep, as it naturally occurs in the brain and apparently mediates the circadian rhythm and sleep. You are sure that she is referring to __________.

• A) melatonin
• B) serotonin
• C) endorphins
• D) norepinephrine

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Definitions:

Check Box

A form control element that allows users to make binary choices, typically represented as a square box that can be marked with a check symbol.

Combo Box

An interactive control found in user interfaces that allows the user to choose an item from a list or type a value.

List Box

A user interface element that displays a list of options from which a user can select one or more items.

Text Box

A GUI element that enables the user to input text information into a document, form, or web page.