You and Your Exercise Buddy Decide to Go to Yosemite

question 45

Multiple Choice

You and your exercise buddy decide to go to Yosemite National Park to hike the famous El Capitan trail. You book your trip through a well known agency but before you leave for your vacation, you learn that there have been two cases of plague reported in people who recently visited a different area of the park. Your friend is anxious and tells you he thinks that plague is really dangerous and kills people everyone who gets it. He points out that this disease killed a lot of people during the Middle Ages, and says he doesn't want to do the trip after all. You decide to do some research on the plague and its causative agent before making a decision about your trip.
-Yersinia pestis is transmitted by fleas. The organism forms biofilms in the digestive tract of infected fleas, often blocking the tract. This prevents the flea from feeding properly, causing bacteria to be regurgitated into the bite wound that the flea has made. In this situation, the flea is a

• A) mechanical vector.
• B) biological vector.
• C) mechanical host.
• D) biological host.
• E) dead-end host.

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Definitions:

Glucose

A simple sugar that is an important energy source in living organisms and a component of many carbohydrates.

Aldosterone

Aldosterone is a hormone produced by the adrenal glands that helps regulate blood pressure by controlling sodium and potassium levels in the blood.

Long-term Regulation

The processes and mechanisms that the body uses to maintain stable internal conditions over long periods.

Blood Sugar Level

The concentration of glucose present in the blood, critical for maintaining energy levels and overall health, regulated by hormonal mechanisms.