A Guide to the Individualized Education Program United States Department of Education guidance to assist educators, parents, and state and local educational agencies in implementing the requirements of Part B of the IDEA regarding IEPs .
Atrophy is the partial or complete wasting away of a part of the body. Causes of atrophy include poor nourishment, poor circulation, loss of hormonal support, loss of nerve supply to the target organ, disuse or lack of exercise, or disease intrinsic to the tissue itself. Hormonal and nerve inputs that maintain an organ or body part are referred to as trophic. more... Atrophy is a general physiological process of reabsorption and breakdown of tissues, involving apoptosis on a cellular level. It can be part of normal body development and homeostatic processes, or as a result of disease.
This increase in parathyroid hormone causes more calcium to be taken from the bone and more calcium to be reabsorbed by the intestines and kidney. Medical conditions that cause low blood calcium levels or interfere with the body's ability to break down and remove phosphate can lead to secondary hyperparathyroidism. Too much phosphate causes changes in calcium levels. Kidney failure is a common cause of secondary hyperparathyroidism. Kidney failure can interfere with the body's ability to remove phosphate. Other causes of secondary hyperparathyroidism may include: Calcium deficiency.