Physician holds a stethoscope to the chest of an elderly patient (all models).

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The body changes as we grow older. Tissues atrophy and the thymus normally shrinks which affects the immune system. Cellular tissue diminishes and is replaced by fatty or connective tissue especially the marrow and skin. About 4000 genes actively instruct the bodies normal function. With aging the number of cells expressing genes in an organ can taper off and numerous different problems can arise.

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Size: 3412px × 5118px
Location: Chicago illinois USA
Photo credit: © Custom Medical Stock Photo / Alamy / Afripics
License: Royalty Free
Model Released: Yes

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