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Your Brother Is an Enthusiatic Hiker

question 75

Multiple Choice

Your brother is an enthusiatic hiker. He returns from a walking vacation and tells you that although he had a good time, he ran into a bit of trouble on one of the days he was away because he had got lost in the woods for several hours. Although he took enough food for the day, your brother ran out of water. Luckily, he came across a small stream and was able to fill up his water bottle and to finish his hike without any further problems. Your brother mentions as an aside that he must have eaten something bad while he was away, because he has had pretty bad diarrhea since he got back. He tells you he doesn't feel too bad, but that he has been having what he describes as "explosive diarrhea." He also complains of abdominal pain. You urge him to go to the doctor because you suspect that he may have something more than just food-related diarrhea.
-There are several stages in the life cycle of G. lamblia. Which is the correct sequence?
1) Trophozoites multiply in the intestine.
2) Mature cysts or trophozoites are released in feces.
3) Cysts pass through the stomach to the lower small intestine.
4) Dehydration in the large intestine stimulates formation of cysts.
5) Cysts enter the mouth by ingestion of contaminated food or water.
6) Trophozoites are released from the cysts.

Definitions:

Bicarbonate Ions

Chemical ions (HCO3-) that act as a major component of the blood's buffering system, helping to maintain the body's pH balance.

Carbonic Acid

A weak acid formed when carbon dioxide dissolves in water, playing a vital role in regulating pH in the blood.

Respiratory Acidosis

A condition occurring when the lungs cannot remove all of the carbon dioxide the body produces, causing body fluids, especially the blood, to become too acidic.

Expiratory Neurons

Neurons involved in the control of the muscles responsible for expelling air from the lungs.