Question at position 30 An example of a positive feedback loop found in humans is Printed Blank[input]Question Blank 1 of 1[input]water content of bloodsweatingcalcium levelschildbirth

Question

BlackTom AI · Accepted Answer

Let's restate the question and consider the likely candidates for a positive feedback loop in humans.
Question: An example of a positive feedback loop found in humans is Printed Blank[input]Question Blank 1 of 1[input]water content of bloodsweatingcalcium levelschildbirth

First, examine each candidate option and recall how positive versus negative feedback operates.
Option: water content of blood. Water balance is typically regulated by osmoregulation and hormones like antidiuretic hormone (ADH) to restore normal fluid status, which is a corrective process acting to return to setpoints. This is characteristic of negative feedback, not a positive loop.
Option: sweating. Sweating is a mechanism to reduce body temperature and brings the system back toward normal after heat buildup. It acts as a stabilizing response, i.e., negative feedback, not a positive feedback amplification.
Option: calcium levels. Calcium homeostasis involves parathyroid hormone and calcitonin to maintain serum calcium within a narrow range. The regulatory responses tend to oppose deviations from the setpoint, typical of negative feedback.
Option: childbirth. In parturition, the process of labor is driven by a cascade where uterine contractions stimulate the release of oxytocin, which intensifies contractions further, amplifying the signal until delivery occurs. This is the classic example of a positive feedback loop in human physiology.
Now, comparing the options, the first three describe regulatory mechanisms that counteract deviations (negative feedback). The fourth describes an amplifying mechanism that enhances the ongoing process until a final event occurs (positive feedback).
In sum, the positive feedback loop among the listed options is the one associated with childbirth, where señales trigger increasing contractions until birth completes the loop. This contrasts with the other physiological processes, which serve to restore homeostasis rather than amplify a response.

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Question at position 39 What stops a positive feedback loop like the one involving oxytocin during childbirth?The removal of the stimulus (birth of the baby)The hypothalamus detecting high sodium levelsA decrease in body temperatureThe onset of dehydration

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