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Joe decided to hike his first “Fourteener” this summer. Unfortunately, he...

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hotmamma18 | Student, College Freshman | (Level 1) Honors

Posted March 28, 2013 at 2:09 AM via web

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Joe decided to hike his first “Fourteener” this summer. Unfortunately, he underestimated the amount of water he need and ran out just as he reached the summit. This meant that Joe was going to have to hike back down the mountain without water. Name and describe two hormones that Joe’s body would release in response to his dehydration.

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clairewait | High School Teacher | (Level 1) Educator Emeritus

Posted March 28, 2013 at 3:03 PM (Answer #1)

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Joe's body would actually release several hormones in response to the physical activity he was undertaking to hike up the mountain in the first place. One of these hormones is actually released in anticipation of potential dehydration.

Aldosterone, released by the adrenals, sends several signals to the body to preserve water when the first signal from the hypothalamus registers the amount of bodily fluid available. First, it signals the kidneys to increase sodium and water retention. Second, it tells the body to produce less urine and increases the release of potassium into the renal system. The result of these internal chemical responses taking place, the physical sensation of thirst is slowed down, which means that by the time Joe feels thirsty, he will already be significantly dehydrated.

More than likely, Joe will then have an adrenaline surge, which is, of course, the "fight or flight" mechanism the body employs in the act of self-defense. Adrenaline is a stimulant which will increase the strength and frequency of heart contractions, as well as speed up the break-down of carbohydrates and fat into glucose for extra energy.

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