Question

negative feedback
which of the following is not an example of a negative feedback mechanism in the human body?
increasing heart rate and force of contraction when blood pressure falls.
when the body is deprived of food, metabolism slows down in order to conserve energy.
secreting insulin after a meal to return blood glucose levels back towards normal.
shivering when body temperature falls below normal.
retention of fluid leading to retention of more fluid.

Explanation:

Negative - feedback mechanisms in the body work to counter - act changes and restore homeostasis. Increasing heart rate when blood pressure falls, slowing metabolism when food is scarce, insulin secretion for blood glucose regulation, and shivering for body temperature regulation are all negative - feedback examples. Fluid retention leading to more fluid retention is a positive - feedback mechanism as it amplifies the initial change rather than countering it.

Answer:

Retention of fluid leading to retention of more fluid.