Haemoglobin Elastin Keratin Collagen( Haemoglobin, Elastin, Keratin, Collagen ) is a functional structural( functional, structural ), globular fibrous( globular, fibrous ) protein with a quaternary primary secondary tertiary( quaternary, primary, secondary, tertiary ) structure consisting of four three two five( four, three, two, five ) polypeptide sub-units. It also has a prosthetic group carboxyl group active site( prosthetic group, carboxyl group, active site ), which is essential to its purpose of carrying oxygen cells glucose insulin( oxygen, cells, glucose, insulin ) around the body.

The role of insulin is to regulate glucose cholesterol water hydrogen ion( glucose, cholesterol, water, hydrogen ion ) concentration in the blood. It does this by binding to a specific nonspecific( specific, nonspecific ) target receptor, which triggers the uptake release synthesis( uptake, release, synthesis ) of glucose cholesterol water ATP( glucose, cholesterol, water, ATP ) into cells and the metabolism of glucose cholesterol glycogen triglycerides( glucose, cholesterol, glycogen, triglycerides ) in respiration photosynthesis glycogenesis glucogenesis( respiration, photosynthesis, glycogenesis, glucogenesis ). The overall effect is a decrease increase( decrease, increase ) in blood glucose cholesterol water hydrogen ions( glucose, cholesterol, water, hydrogen ions ) concentration.