Biology of Human Aging |
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ability accumulation acids activity affect Age-Related Changes altered alveoli amount appear areas arteries associated become begins blood vessels body bone brain calcium called cancer cardiac cartilage cause cavity cells cellular changes collagen common composed condition connective consider consists contain continues contractions cytoplasm decline decrease degeneration develop digestive diminished disease division Dysfunctions elastic elderly persons enter enzymes fibers flow fluid formation functioning gland glucose gradually heart hormones immune important impulses increase intestine involved joint kidneys known large intestine layer less levels lining located loss lungs maintain membrane movement muscle nerve nervous system neurons normal occur older persons organs pressure produce proteins receptors reduced referred regions released remain replaced reported require responses result secretion skeletal muscle skin specific spinal Structure studies substances suggested supply surface surrounded taste tend thought tion tissue types undergo various vitamins volume walls women