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Physiological Changes

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The human body manifests physiological changes in every organ system throughout the process of eating, from the time a person first anticipates food to the elimination of waste.

a) design a controlled experiment where you test the hypothesis that the body's reaction to eating begins before food enters the body.

b) describe physiological changes that occur in three different organ systems when food is ingested and how these systems coordinate a response in the human body.

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Solution Preview

One hypothesis we could test would be how the digestive system responds to the aroma of food, but not its sight. I would choose a very aromatic food such as freshly baked bread.

Obtain 20 volunteers and randomly divide them into two groups -- a control group and an experimental group.

Blindfold each individual. Expose the experimental group to the scent of freshly baked bread.

Expose the control group to the scent of ... nothing.

Of course, no individual should know what group he's in. It should be blind.

Make sure that no food enters the mouths of anyone.

Collect saliva from each of the 20 individuals before the experiment begins. That means that we collect saliva for all 20 individuals before they are exposed to ...