Hormones:

Hormones are the chemical substances secreted by the endocrine glands. They carry electro-chemical messages to different parts of the body. Hormones are circulated in the body through blood. The function of endocrine system depends upon these hormones. These hormones work in the similar way as the nervous system works in the body. Insulin, glucagon, thyroxin and testosterone are few kinds of hormones. Hormones play an important role in a living organism. A small amount of hormones in the blood produces specific effects in the body. Several dozen hormones travel through the blood stream and influence different kinds of target cells, modifying their activity in a variety of ways.

Antibody:

• Antibody is a protein produced by white blood cells that help to destroy bacteria.
• Antibodies react with the antigens and inactivate or destroy them.
• A large number of antibodies are produced in blood which are targeted against various types of antigens.
• Antigens are foreign molecules, cells, bacteria, viruses or fungi which enter the body usually a disease causing microorganisms.
• Antibodies are the integral part of the defence mechanism of human body.
• They are also involved in immunity against disease.

Haemophilia:

• It is a disease in which the person has prolonged blood clotting time resulting in excessive bleeding from injury.
• It is due to the deficiency of vitamin K.
• It is a semi lethal disease controlled by recessive gene.
• It is less common in women than in men.