What is a control center, A test tube contains starch,

Q1. A test tube contains starch, pancreatic amylase, and water. The buriet is negative. After 30 minutes, Benedict’s test is positive. What substance is present?

Q2. Calcium levels in Mr. Gallariani’s blood are dropping to dangerously low levels. The hormone PTH is released and shortly blood calcium levels begin to rise. Shortly after, PTH release slows. Is this an example of positive or negative feedback mechanism? What is the initial stimulus? What is a receptor? What is a control center? What it effector? What is the result?

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