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epinephrine

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Q: The primary hormone responsible for physiological and stress responses such as increased heart rate is?
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Is the hormone responsible for increased sodium reabsorption?

anti diuretic hormone


How fast are hormonal responses?

Slower than nervous responses. Varies according to what hormone, for example the hormone epinephrine (adrenaline) works almost instantaneously to initiate increased mental alertness among other things. Some hormones take longer to take effect but most take action relatively quickly seconds -> hour


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