Which of the following is not an example of positive feedback?
Correct answer: D. As blood calcium level increase, parathyroid hormone (PTH) is reduced
- A. A forest fire slowly expand outward, which provide it with even more fuel to burn
- B. During childbirth, oxytoxin creates a stimulus which causes the hypothalmus to release more oxytocin
- C. As more buffalo begin to run in a herd, the overall level of panic increases. This results in even more baffalo running
- D. As blood calcium level increase, parathyroid hormone (PTH) is reduced
Explanation
The release of parathyroid hormone (PTH) in response to decreased blood calcium levels helps increase calcium levels, and the subsequent reduction or cessation of PTH release occurs when calcium levels return to normal, creating a negative feedback loop.
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Chemical coordination uses hormones released by endocrine glands and carried in blood to specific target cells. Coverage includes the pituitary, thyroid, pancreas, adrenal glands, ovaries and testes, feedback control, and the contrast between slower, longer-lasting hormonal responses and rapid nervous coordination.
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