Acute Review Date: 11/4/2012 Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, David R. Eltz, and Stephanie Slon. A.D.A.
Adolescent development During adolescence, children develop the ability to: Understand abstract ideas, such as higher math concepts, and develop moral philosophies, including rights and privileges Establish and maintain satisfying relationships by learning to share intimacy without feeling worried or inhibited Move toward a more mature sense of themselves and their purpose Question old values without losing their identity PHYSICAL DEVELOPMENT During adolescence, young people go through many changes as they move from childhood into physical maturity.
Adolescent test or procedure preparation There are a number of ways to help an adolescent prepare for a medical test or procedure. First, provide detailed information and explain reasons for the procedure.
Adrenal glands Adrenal glands are triangle-shaped glands located on top of the kidneys. The outer part of the adrenal gland is called the cortex and produces steroid hormones such as cortisol , aldosterone , and testosterone . The inner part of the adrenal gland is called the medulla and produces epinephrine and norepinephrine , which are commonly called adrenaline and noradrenaline. When the glands produce more or less hormones than your body needs, you can become sick.
Aerobic Review Date: 11/4/2012 Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, David R.
Aging changes in body shape Your body shape changes naturally as you age. Some of these changes cannot be avoided but your lifestyle choices may slow or speed the process. The human body is made up of fat, lean tissue (muscles and organs), bones, and water. After age 30, the people tend to lose lean tissue. Your muscles, liver, kidney, and other organs may lose some of their cells. This process of muscle loss is called atrophy. Bones may lose some of their minerals and become less dense (a condition called osteopenia, or at its laterstage, osteoporosis).
Aging changes in hair and nails Your hair and nails function to protect your body. They also keep the temperature of your body steady. Another important function of the hair and nails is to help you (sense) feel things. As you age, your hair and nails begin to change. Hair Changes and Their Effects Hair color change. This is one of the clearest signs of aging. Hair color is due to a pigment called melanin , which is produced by hair follicles. These are structures in the skin that make and grow hair.
Aging changes in hormone production The endocrine system is made up of organs and tissues that produce hormones. Hormones are natural chemicals produced in one location, released into the bloodstream, then used by other target organs and systems. The hormones control the target organs. Some organ systems have their own internal control systems along with, or instead of, hormones. As we age, changes naturally occur in the way that body systems are controlled.
Aging changes in immunity Your immune system helps protect your body from foreign or harmful substances. Examples are bacteria, viruses, toxins, cancer cells, and blood or tissues from another person. The immune system makes cells and something call antibodies that destroy these harmful substances. Aging Changes and Their Effects on the Immune System As you grow older, your immune system changes and does not work as well: It is slower to respond. This increases risk of getting sick.