aging changes in organs, tissue, cells…

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tissue types, epithelial tissue, muscle tissue includes two types of tissue, striated muscles, that that move the skeleton, voluntary muscle, smooth muscles, muscles that surround the stomach, nerve tissue is made up of nerve cells, neurons, carry messages to, from various parts, brain is made of nerve tissue, aging changes, cells, the basic building blocks of tissues, all cells experience changes, aging, become larger, less able to divide, reproduce, among other changes, an increase in pigments, fatty substances inside the cell, lipids, many cells lose ability to function, begin to function abnormally, waste products accumulate in tissue, aging, a fatty brown pigment, lipofuscin collects in many tissues, other fatty substances, connective tissue changes, becoming increasingly stiff, makes the organs, blood vessels, airways more rigid, cell membranes change, many tissues have more trouble receiving oxygen, nutrients, getting rid of carbon dioxide, wastes, many tissues lose mass, process, atrophy, tissues, become lumpy, nodular, rigid, cell, tissue changes, organs also change, aging organs gradually but progressively lose function, decrease, in the maximum functioning capacity, not notice this loss, seldom need, use organs to fullest capability, organs have a reserve ability to function beyond the usual needs, heart of a 20-year-old is capable of pumping, 10 times the amount that is actually needed to preserve life, after age 30, an average of 1% of this reserve is lost each year, most significant changes in organ reserve occur, in the heart, lungs, kidneys, reserve lost, between people, between different organs, single person, changes appear slowly, over a long period of time, an organ is worked harder than usual it, not be able to increase function, sudden heart failure, the body is worked harder than usual, things that produce an extra workload, body stressors, certain medications, illness, significant life changes, suddenly increased physical demands on the body, a sudden change in activity, exposure to a higher altitude, loss of reserve also makes it harder, restore equilibrium, drugs, detoxified at a slower rate, lower doses of medications needed, side effects, become more common, medication side effects, mimic the symptoms of many diseases, it is easy to mistake a drug reaction, an illness, medications have entirely different side effects, in the elderly than in younger people, aging theory, no one really knows how, why people change, they get older, theories claim that aging, accumulated injuries from ultraviolet light, wear, tear on the body, by-products of metabolism, theories view aging, a predetermined, genetically-controlled process, no theory sufficiently explains all the changes, the aging process, aging, complex, varied process, in how it affects different people, different organs, most gerontologists, people who study aging, feel that aging, cumulative effect, the interaction of many lifelong influences, influences include heredity, environment, cultural influences, diet, exercise, leisure, past illnesses, many other factors, unlike the changes of adolescence, predictable to, a few years, ages at a unique rate, systems begin aging, age 30, aging processes, not common, much later, some changes typically occur, aging, occur at different rates, to different extents, no reliable way to predict specifically how, terms, atrophy, cells shrink, enough cells decrease in size, entire organ atrophies, a normal aging change, occur in any tissue, most common in skeletal muscle, heart, brain, secondary sex organs, breasts, atrophy, reduced use, decreased workload, decreased blood supply, nutrition, cells, reduced stimulation by nerves, hormones, hypertrophy, cells enlarge, size increase, an increase in cellular proteins, cell wall, internal cell structures, not an increase, in the cell's fluid, cells atrophy, hypertrophy in an attempt to compensate, loss of cell mass, hyperplasia, number of cells increases, an increased rate of cell division, hyperplasia, occurs in an attempt to compensate, loss of cells, allows some organs, tissues to regenerate, the skin, lining, the intestines, liver, bone marrow, liver is especially good at regeneration, replace up to 70% of its structure, 2 weeks after an injury, tissues, limited ability to regenerate include bone, cartilage, smooth muscle, muscles around the intestines, tissues that seldom, never regenerate include nerves, skeletal muscle, heart muscle, lens, the eye, injured, tissues, replaced, scar tissue, dysplasia, organization of mature cells becomes abnormal, atypical hyperplasia, dysplasia is fairly common, in the cells, the cervix, lining, the respiratory tract, neoplasia, formation of cancerous, malignant tumors, an extension, the processes causing hyperplasia, hypertrophy, neoplastic cells reproduce rapidly, have unusual shapes, abnormal function, related topics, aging changes in hormone production, aging changes in immunity, aging changes, in the skin, aging changes in sleep, aging changes, in the bones, muscles, joints, aging changes, in the breast, aging changes, in the face, aging changes, in the female reproductive system, aging changes, in the heart, blood vessels, aging changes, in the kidneys, aging changes, in the lungs, aging changes, in the male reproductive system, aging changes, in the nervous system.