Examlex
Which of the following is an injection into the circular flow?
Stimulant
A substance that raises levels of physiological or nervous activity in the body, often used to increase alertness, attention, and energy.
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 phases.
Aging
The process of becoming older, which includes biological, emotional, intellectual, and social changes.
Hypothalamus
A region of the brain that regulates basic biological needs and motivational systems such as hunger, thirst, and body temperature.
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