The most beneficial effect of fever is that it
(a) Inhibits the spread of some bacteria and viruses
(b) Increases the metabolic rate by up to 10 percent
(c) Stimulates the release of pyrogens
(d) Achieves a and b

Verified step by step guidance

Step 1: Understand what fever is — a rise in body temperature often caused by the immune system responding to infection.

Step 2: Recognize that fever can inhibit the growth and spread of some bacteria and viruses because many pathogens have an optimal temperature range for survival.

Step 3: Know that fever increases the metabolic rate, which can enhance immune system activity and speed up tissue repair.

Step 4: Identify that pyrogens are substances that cause fever by signaling the hypothalamus to raise body temperature, so stimulating their release is a cause, not a beneficial effect of fever.

Step 5: Conclude that the most beneficial effects of fever include both inhibiting pathogens and increasing metabolic rate, which corresponds to option (d) — achieving both (a) and (b).

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Fever and Immune Response

Fever is a regulated rise in body temperature that helps the immune system fight infections. It creates an environment less favorable for the growth and spread of certain bacteria and viruses, enhancing the body's defense mechanisms.

Metabolic Rate Increase During Fever

Fever raises the body's metabolic rate, often by about 10%, which accelerates immune functions such as the production of white blood cells and antibodies. This increased metabolism supports faster healing and pathogen elimination.

Role of Pyrogens in Fever

Pyrogens are substances, often produced by pathogens or immune cells, that trigger the hypothalamus to raise body temperature. They initiate fever but are not the beneficial effect themselves; rather, they cause the fever that leads to immune benefits.

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Textbook Question

Perforins are proteins associated with the activity of

(a) T cells

(b) B cells

(d) Plasma cells

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Textbook Question