Pepsin is a digestive enzyme. It is made in an inactive form, pepsinogen, which is activated by the acidity of the stomach to self-cleave. The cleaved molecule is active pepsin, which goes on to cleave more pepsinogen molecules, leading to a cascade of rapid pepsin activation. This pathway is an example of.

A. a positive feedback loop.
B. conditioning.
C. a negative feedback loop.
D. feedforward regulation.
E. homeostasis

Explanation:

Pepsinogen is an inactive enzyme which is activated into active digestive enzyme known as pepsin. It is a digestive enzyme which causes breakdown of proteins. Active pepsin causes cleavage of more pepsinogen molecule by a positive feedback loop and leads to increase in the concentration of active pepsin molecule.

Its concentration increases according the requirement in the body which is controlled by feedback system.

Explanation:

  (A) positive feedback loop

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nb

explanation:

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