Why is the presence of amylase in human blood not harmful?

The presence of amylase in human blood is not harmful because it is specific to starch. Amylase is an enzyme that catalyzes the hydrolysis of starch into sugars, primarily maltose. The specificity of enzymes means they only act on particular substrates—in the case of amylase, that substrate is starch. Since amylase does not interact with other cellular components or proteins in the body, its activity is limited to starch digestion, preventing any potential harm to other biological processes.

In addition, having amylase in the blood is typically a result of its secretion from the salivary glands or pancreas during digestion, indicating a natural support system for carbohydrate metabolism. This process is well regulated, ensuring that the enzyme levels in the bloodstream remain consistent and do not interfere with normal bodily functions. The other options do not accurately describe the role or nature of amylase and its presence in the bloodstream.