understanding feedback systems
feedback is an important concept in science, especially in biology, environmental science and
engineering. a feedback system is a system that regulates itself by monitoring its own output.
that is, it “feeds back” (sends back) some of what it produces back to itself, thus maintaining
homeostasis. for example, when preparing for a concert, sound engineers do a ‘sound check’
- if the music is too loud, they reduce the volume; if it is too low, they raise the volume. sound
engineers will make many adjustments until the volume is at the correct level.

positive feedback occurs when a change in a system causes even more change in the same
direction, making the outcome stronger or bigger (hint: more and more is ‘positive’). negative
feedback occurs when a change in a system causes a response that brings things back to
normal, reducing the effect of the original change. (hint: the deviation from normal is stopped
and is ‘negative’) both types of feedback help systems stay balanced or, sometimes, move
away from balance.

use the above text to determine if these examples are positive or negative feedback:
__________14) when blood glucose levels increase, insulin is released into the blood, thereby
reducing blood glucose to normal levels.

__________15) you scored an 85 on a math test! the teacher gave you a sticker and a candy bar.
you feel great, and will study more and intend to score higher on the next exam.

Question

understanding feedback systems
feedback is an important concept in science, especially in biology, environmental science and
engineering. a feedback system is a system that regulates itself by monitoring its own output.
that is, it “feeds back” (sends back) some of what it produces back to itself, thus maintaining
homeostasis. for example, when preparing for a concert, sound engineers do a ‘sound check’
- if the music is too loud, they reduce the volume; if it is too low, they raise the volume. sound
engineers will make many adjustments until the volume is at the correct level.

positive feedback occurs when a change in a system causes even more change in the same
direction, making the outcome stronger or bigger (hint: more and more is ‘positive’). negative
feedback occurs when a change in a system causes a response that brings things back to
normal, reducing the effect of the original change. (hint: the deviation from normal is stopped
and is ‘negative’) both types of feedback help systems stay balanced or, sometimes, move
away from balance.

use the above text to determine if these examples are positive or negative feedback:
__________14) when blood glucose levels increase, insulin is released into the blood, thereby
             reducing blood glucose to normal levels.

__________15) you scored an 85 on a math test! the teacher gave you a sticker and a candy bar.
             you feel great, and will study more and intend to score higher on the next exam.

Accepted Answer

# Brief Explanations:
## For Question 14:
The text defines negative feedback as a change causing a response that brings things back to normal. Here, increased blood glucose leads to insulin release, which reduces glucose to normal levels. This matches negative feedback's description (reducing the original change's effect).

## For Question 15:
Positive feedback is a change causing more change in the same direction. Scoring 85 (a change) leads to rewards, which make you study more to score higher (more change in the direction of better scores), fitting positive feedback.

# Answer:
14. Negative Feedback
15. Positive Feedback

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Explanation:

For Question 14:

For Question 15:

Answer: