An instrument that magnifies slight differences in the refractive index of cell structures is called a (n) microscope.

It’s called the phase-contrast microscope.

Explanation:

Answer:

1. Response to hydrochloric acid

HCO3- also known as bicarbonate, is a polyatomic anion, a byproduct of the body's metabolism and one of the two main components of the pancreatic juice. A base excreted by the epithalial cells of the pancreas, bicarbonate has the critical function of neutralizing the hydrochloric acid found in the gastric juice. This is why the pancreatic juice contains mostly bicarbonate when this acid is present.

2. Response to fat

When fats are predominant, the second component of the pancreatic juice, the digestive enzymes are abundant. This broad group of biological catalysts have the role of reducing all digestible macromolecules (such as fats) into forms that can be absorbed by the body. They are critical to the digestive process.