Examlex
A radioactive source has a half-life of 2 min. At time t = 0 it is placed near a detector and the counting rate is observed to be 3000 counts/s. If the detection efficiency is 25%, how many radioactive nuclei are there at time t = 0?
Sympathetic Nervous System
A part of the autonomic nervous system that prepares the body for physical activity by accelerating the heart rate, increasing blood pressure, and dilating the airways, among other responses.
Parasympathetic Nervous System
A division of the autonomic nervous system responsible for conserving energy and promoting relaxation and recovery after periods of stress.
Digestion
The biological process by which the body breaks down food into absorbable nutrients.
James-Lange Theory
A theory of emotion proposing that emotions occur as a result of physiological reactions to events.
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