What are the major proteins found in blood?

Albumin and globulins are indeed major proteins found in blood, playing crucial roles in various physiological processes. Albumin, the most abundant plasma protein, is essential for maintaining osmotic pressure and transporting various substances, including hormones, vitamins, and drugs. It ensures that fluids remain within the bloodstream, preventing edema and contributing to overall fluid balance.

Globulins, which encompass a diverse group of proteins, are involved in immune function, transporting metals and lipids, and serving as enzymes. They include immunoglobulins, which are antibodies critical for immune response, as well as other types involved in transport and clotting processes.

While the other options contain proteins associated with blood, they do not represent the primary categories of proteins present in plasma. For example, hemoglobin is specifically found within red blood cells and is not classified as a plasma protein. Platelets and white blood cells are cellular components of blood but are not proteins, thus falling outside the context of this question focused on protein constituents.