Problems of Ageing: Biological and Medical Aspects

achlorhydria activity adult advancing age age changes age groups ageing process alterations Anat animals anterior pituitary appear Arch arteries arteriosclerosis atrophy average become blood body bone calcium cancer capillaries carcinoma cartilage cells cementum cent clinical connective tissue death decade decline decrease degeneration dentin diet disease effect elastic tissue emphysema endocrine epithelial epithelium estrogens evidence experimental extracellular factors female fibers follicles function gallbladder gastric glands grams growth histological hormone human hypertrophy increase individual involution kidney less liver lives longevity lung lymph nodes lymphatic tissue lymphocytes macronucleus male maturity membrane menopause metabolism mitosis muscle nerve normal observed occur old age older organs ovaries pathological patients period persons Physiol physiological pituitary present probably problem prostate protein rats regarded relatively respiratory senescence senile sexual skin span spleen structure symptoms thymus thyroid tion tissue fluid tubules vascular vessels weight women young