Question at position 7 Which of the following would be an example of positive feedback? Release of oxytocin to increase the strength of labor contractions Release of glucagon to increase a lower-than-normal level of glucose in the blood Release of insulin to decrease a high level of glucose in the blood Shivering to generate heat in a situation where body temperature is below normal

Question

Question at position 7  Which of the following would be an example of positive feedback? Release of oxytocin to increase the strength of labor contractions Release of glucagon to increase a lower-than-normal level of glucose in the blood Release of insulin to decrease a high level of glucose in the blood Shivering to generate heat in a situation where body temperature is below normal

BlackTom AI · Accepted Answer

The question asks for an example of a positive feedback mechanism in physiology. 
Option 1: Release of oxytocin to increase the strength of labor contractions. This is a classic positive feedback loop: stronger contractions stimulate more oxytocin release, which in turn strengthens contractions, amplifying the response until delivery occurs. 
Option 2: Release of glucagon to increase a lower-than-normal level of glucose in the blood. This is a corrective process but functions as a feedforward/negative feedback-type response, since it raises blood glucose toward a set point rather than amplifying an ongoing response. 
Option 3: Release of insulin to decrease a high level of glucose in the blood. Insulin release lowers blood glucose and opposes the initial change, which is characteristic of negative feedback, not positive feedback. 
Option 4: Shivering to generate heat in a situation where body temperature is below normal. Shivering helps restore normal temperature and acts as a negative feedback mechanism, reducing the deviation from the set point rather than amplifying it. 
In summary, among the options, the only instance that truly demonstrates positive feedback—where the response reinforces and amplifies the initiating stimulus—is the oxytocin-driven labor contraction example. The other scenarios depict regulatory processes that counteract the deviation and restore homeostasis, aligning with negative feedback principles.

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