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Tenth grade > A.1 Determine the main idea of a passage TRH

Read the passage.

28

How Fevers Help

oy

Fevers can be uncomfortable, but the upside is that they are evidence of the body's Go

attempt to heal. When a person develops an infection, a section of the brain called the

hypothalamus recognizes a threat. The hypothalamus responds by increasing the body's

temperature. Since both viruses and bacteria are temperature sensitive, this environment

helps prevent them from multiplying. In addition, scientists have found evidence that

fevers may increase the number of certain lymphocytes—white blood cells that are part of

the immune system. Increased lymphocytes make the body more effective in destroying

infected cells. Of course, this doesn't mean that high fevers don't warrant medical

treatment. In fact, another reason that fevers are beneficial is that they serve as warning

signs, indicating that something is amiss.

What is the main idea of the passage? ~

Me

Fevers are useful because they increase the body's lymphocytes.

Fevers are useful because they help the body fight infections.

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