Question

Consider two variables: A and B.

True or False: A positive feedback loop arises when A increases B, and B increases A.

True

False

Consider the following scenario:

When Sharon accidentally cuts her hand, blood platelets attach to the damaged tissue. As the blood platelets cling to the open wound and begin to form a clot, they release chemicals that attract more platelets to the wound, which in turn release more of these chemicals until the clot has covered the wound.

This interaction between blood platelet attachment and the release of the chemicals that attract platelets is/ is not an example of a positive feedback loop.

Answer 1

ANS

True , the statement is true as the positive feedback loop  arises when A increases B, and B increases A . In the situation of positive feedback the action causes reaction and due to this reaction the action increases again and due to which there is circular loop and due to which there is a positive increment in action and reaction. Beside of the example given in the case the another example is that a herd of deer runs and when they run, it causes the disturbance and due to this disturbance the herd of deer runs and this causes positive feedback situation.