Examlex
Low levels of ______ during pregnancy can produce neural-tube defects.
Endorphins
Natural chemicals produced in the brain that act as painkillers and are associated with feelings of pleasure and euphoria.
Psychoactive Drugs
Substances that alter brain function, resulting in temporary changes in perception, mood, consciousness, and behavior.
Sleep
A naturally recurring state of mind and body characterized by altered consciousness, relatively inhibited sensory activity, reduced muscle activity, and inhibition of nearly all voluntary muscles during rapid eye movement (REM) sleep.
Appetite
The natural desire to satisfy bodily needs for food, influenced by psychological, physiological, and environmental factors.
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