Physiology of Animal and Man

Iron overload is an excess iron in the body. Excess iron in vital organs, even in mild cases of iron overload, increases the risk for liver disease like cirrhosis, cancer , heart attack or heart failure, diabetes mellitus, etc.,  but it is not a cause of polycythaemia.

Addison's disease is a rare endocrine disorder. It occurs when the adrenal glands cannot produce sufficient corticosteroids.It does not causes edema.

All cells of the immune system originates in the bone marrow and they include myeloid (neutrophils, basophils, eosinpophils, macrophages and dendritic cells) and lymphoid (B lymphocyte, T lymphocyte and Natural Killer) cells which differentiate along distinct pathways.

It is the correct statement as on antigenic stimulation, the germinal centers accomodates large populations of B lymphocytes undergoing mitosis and plasma cells secreting antibodies.

Bowel obstruction is a obstruction of the intestines, preventing the normal transit of the products of digestion. It is common and is usually managed medically using subcutaneous medication given via a syringe driver.