Final answer:
Regular insulin is an endocrine hormone that helps cells take up glucose from the blood, thereby decreasing the blood glucose level.
Step-by-step explanation:
Regular insulin is an endocrine hormone secreted by the beta cells of the pancreas. Its main function is to help cells take up glucose from the blood, which leads to a decrease in the blood glucose level. Regular insulin has a molecular weight of 5734 Da and is made up of two chains, chain A and chain B, composed of amino acids.