Question

two types of feedback mechanisms
positive feedback

definition: a cause - and - effect chain that ends by -
(instead of bringing the system back to normal).
example(s):

negative feedback

definition: a self - correcting system,
example(s):

Explanation:

For Positive Feedback: The definition requires filling in that it amplifies the initial change (moves the system further from normal, not back). Common examples include childbirth (oxytocin release intensifies contractions) and blood clotting (platelet activation triggers more clotting).
For Negative Feedback: The definition is completed by stating it reverses deviations to return the system to a set point. The given example is body temperature regulation; other examples include blood glucose regulation (insulin lowers high blood sugar) and pH balance in the body.

Answer:

Positive Feedback

Definition: A cause-and-effect chain that ends by amplifying the initial change (instead of bringing the system back to normal).
Example(s): Childbirth (oxytocin-induced contractions increase in strength until delivery), blood clotting (platelets attract more platelets to form a larger clot)

Negative Feedback

Definition: A self-correcting system, that reverses deviations to return the system to a stable, normal state.
Example(s): Body temperature regulation (as shown), blood glucose regulation (insulin reduces elevated blood sugar levels), regulation of blood pressure (baroreceptors signal the body to lower pressure when it is too high)