Feedback Mechanism

Which of the following is a good definition of homeostasis?

• Homeostasis means that our body monitors the value of several

  parameters and prevents them from ever changing.

• Homeostasis means that our body doesn't regulate the value of

  different body parameters.

• Homeostasis means that our body monitors the value of several

  parameters and restores them to their correct value after any

  alteration.

• Homeostasis means that we stand still all the time.

Which of the following variables do our bodies regulate:

• Blood volume

• Body temperature

• Glucose concentration in blood

• Salt concentration in blood

• All answers are correct

What type of feedback loop is shown?

• Positive

• Negative

• Neutral

Which of the following is an example of positive feedback to indirectly

maintain homeostasis?

• your blood vessels dilate and you begin to sweat in response to elevated

  body temperature

• your blood vessels constrict and you begin to shiver in response to low

  body temperature

• your coach compliments you on your performance in practice

• the chemical reactions involved in blood clotting

When glucose levels in the blood rise, your brain sends a signal to your

pancreas. The pancreas releases insulin, which opens channels in cell

membranes to allow glucose to enter the cell, lowering blood sugar levels.

• Negative Feedback

• Positive Feedback

When the response is amplifies this is an example of a ...

• Positive Feedback

• Negative Feedback

When the imbalance is counteracted this is an example of a ...

• Positive Feedback

• Negative Feedback

Which feedback loop helps an organism to get back to the set point and maintain homeostasis?

• Positive Feedback

• Negative Feedback

Labor contractions is an example of which type of feedback?

• Positive Feedback

• Negative Feedback

When you blood sugar levels rise the body releases insulin which causes the cells to uptake sugar. Which type of feedback?

• Positive Feedback

• Negative Feedback