Examlex
_____, linked to substance abuse and dependence, is the development of a series of symptoms, often involving psychological or behavioral changes, directly related to intake of a substance and its influence on the central nervous system.
Norepinephrine
A neurotransmitter and hormone involved in the body's fight or flight response; it affects heart rate, blood pressure, and glucose levels.
SA Node
The sinoatrial node, a group of cells located in the right atrium of the heart that generates electrical impulses initiating each heartbeat.
SA Node
The sinoatrial node, often called the heart's natural pacemaker, initiates electrical impulses that set the rate and rhythm of heartbeats.
Ventricular Contractions
The tightening of the heart's ventricles, which pumps blood out of the heart and into the arteries.
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