The volume of Brian urine after a long run in the hot summer sun would be small amount of concentrated urine.
What is dehydration?
Dehydration is defined as the excessive decrease in the fluid content of the body due to the following reasons:
- Heat: Increase in temperature of the body or environment leads to loos of water from the body system.
- Excessive activity: This includes strenuous exercise especially under the sun can lead to loss of water from the body.
- Insufficient fluid consumption: Decreased fluid intake affects the water balance of the body.
- Excessive sweating or medication side effects: There are certain drugs that requires enough water consumption for its effective metabolism in the body. Such drugs can affect the water balance of the body.
From the question given, Brian was involved in an excessive activity such as long run in the hot sun.
The body maintains and internal environment by reducing the amount of urine output which is concentrated due to lack of water.
Learn more about dehydration here:
https://brainly.com/question/1301665
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