What Do You Know? The chart below lists examples of feedback mechanisms. Classif

Question

What Do You Know? The chart below lists examples of feedback mechanisms. Classify each one as a positive or a negative feedback mechanism, and explain your reasoning. Write your answers in the right column of the chart using complete sentences Feedback Mechanism Positive or Negative? Why? A single sheep begins to flee from the herd. This POsLLi VP stimulates several other sheep to flee. Soon, the entire flock is fleeing. A stampede occurs A sensor near the brain detects an elevation in blood pressure. The brain sends a signal to the heart to slow down. Blood pressure begins to drop. Receptors in the kidneys detect a low level ofvoaitiUp oxygen in the blood. The kidneys secrete a hormone that stimulates red blood cell production. Soon, the level of oxygen in the blood begins to rise. You cut your finger. Cells near the cut release signals to attract platelets, which help in clottng o fi vp to the cut. When the platelets arrive, they send out signals to attract other platelets Accelerate Learning

Explanation / Answer

1. This is an example of negative feedback. This is because the final result is not beneficial to the system as the population of sheep goes down.

2. This is an example of negative feedback because the rise of blood pressure slows down heart. Hence a negative signal is sent due to which the value of heart rate decreases.

3. This is an example of positive feedback because the result is stimulation due to which a positive value is added.

4. This is positive feedback because the number of platelets keeps increasing.

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