Question

which of the following is most similar to the negative feedback mechanism in human physiology?
a a car runs out of gas and stops
b a toilet tank stops refilling once its full after a flush
c an automatic door opens as soon as somebody approaches it
d a clock ticks on a shelf
e a teacher marks all the wrong answers on students exam papers

Explanation:

Negative - feedback in human physiology works to maintain homeostasis by counter - acting changes. A toilet tank stopping refilling once full is similar as it senses the full state (a change from empty) and stops the filling process to maintain a stable level, just as negative - feedback mechanisms in the body sense changes and work to restore the normal state. The other options do not involve such a regulatory process to maintain a stable state.

Answer:

B. A toilet tank stops refilling once its full after a flush