The answer would be:
<em><u>D. Insulin</u></em>
Insulin is a chemical messenger that is responsible for the regulation of blood glucose levels. It is manufactured in the pancreas and secreted by the beta cells as a response to glucose. When glucose levels in blood plasma increase, insulin is secreted to stimulate glucose uptake.
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This is in contrast to physiology<span>, which deals primarily with function. </span>Morphology<span> is a branch of life science dealing with the study of gross structure of an organism or taxon and its component parts.</span>
Since Matt has never taken piano lessons but plays like a professional pianist, everyone assumes he acquired the skill through osmosis.