Which of the following is an example of homeostasis in humans?

• A. Producing antibodies after exposure to a pathogen
• B. Increasing heart rate during exercise to deliver more oxygen to muscles
• C. Digesting food to obtain energy for cellular processes
• D. Sweating to cool the body when internal temperature rises

Answer: (D)

Verified step by step guidance

1. Understand the concept of homeostasis: it is the process by which organisms maintain a stable internal environment despite changes in external conditions.
2. Identify the examples given and analyze whether they involve maintaining internal stability or simply responding to external stimuli without regulating internal conditions.
3. Recognize that producing antibodies is part of the immune response, which defends the body but does not directly maintain internal balance.
4. Note that increasing heart rate during exercise is a response to increased demand but is part of a regulatory mechanism to maintain oxygen supply, which relates to homeostasis.
5. Focus on sweating as a classic example of homeostasis because it helps regulate body temperature by cooling the body when internal temperature rises, maintaining thermal balance.