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What electrical event must occur for atrial contraction to occur?
Vital Capacity
The maximum amount of air a person can expel from the lungs after a maximum inhalation, used to assess the health of respiratory functions.
Endorphins
Natural chemicals in the body that act as painkillers and mood enhancers.
Serotonin
A neurotransmitter that has a key role in regulating mood, digestion, sleep, and other bodily functions.
Endogenous Opioids
Natural pain-relieving peptides produced by the body, such as endorphins, that modulate pain and stress responses.
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