What is one type of protein found in blood plasma?

Globulins are indeed a type of protein found in blood plasma. They play several critical roles in the body, including the transport of nutrients and hormones, as well as functioning in the immune response. Specifically, gamma globulins are a type of globulin that act as antibodies to help protect the body from pathogens.

While insulin is a crucial hormone involved in glucose metabolism, it is not classified as a plasma protein but rather as a peptide hormone produced by the pancreas. Fibrinogen is another essential plasma protein that plays a vital role in blood clotting, but it is not classified under the globulin group. Keratin, conversely, is a structural protein primarily found in hair, nails, and skin and is not present in blood plasma. Therefore, globulin is correctly identified as a type of protein found in blood plasma, highlighting its significant functions within the circulatory system.