Questions: Which of the following is an example of negative feedback in homeostasis? During childbirth, the body produces oxytocin to cause muscle contraction. As blood sugar increases, the body produces insulin to continually raise the blood sugar higher. Platelets coagulate at the site of an injury and send signals to attract more platelets to the spot. When the body temperature drops, the body will shiver to manually increase the temperature.

The answer is the last one: When the body temperature drops, the body will shiver to manually increase the temperature.

Explanation for each option:

1. During childbirth, the body produces oxytocin to cause muscle contraction.
   This is an example of positive feedback, not negative feedback. In positive feedback, the response enhances or amplifies the initial stimulus. During childbirth, the release of oxytocin increases contractions, which in turn leads to more oxytocin release.

2. As blood sugar increases, the body produces insulin to continually raise the blood sugar higher.
   This statement is incorrect. Normally, insulin is produced to lower blood sugar levels, not raise them. The description here does not accurately represent a feedback mechanism.

3. Platelets coagulate at the site of an injury and send signals to attract more platelets to the spot.
   This is another example of positive feedback. The initial response (platelet aggregation) is amplified by attracting more platelets to the site of injury.

4. When the body temperature drops, the body will shiver to manually increase the temperature.
   This is an example of negative feedback. Negative feedback mechanisms work to counteract changes and maintain homeostasis. When body temperature drops, shivering generates heat to raise the temperature back to normal levels.

In summary, negative feedback mechanisms aim to restore balance by counteracting changes, and the example of shivering to increase body temperature fits this description.