And Back Of

This frail connection exists in part because the optic nerve, which carries visual signals from the retina to the brain, connects to the retina only from the inside of the eye, not from the back

Unwanted flow of food

COMMON UPPER PASSAGEWAY FOR FOOD AND AIR When food travels toward the esophagus, a flaplike tab of cartilage (the epiglottis) closes off the trachea, or windpipe. With age, a progressive loss of muscle tone decreases the tightness of the seal, raising the risk of inhaling food or drink

Retina

ENLARGED, MOBILE OUTER EAR Would collect sound with greater efficiency, to compensate for internal breakdowns

MORE PLENTIFUL AND DURABLE HAIR CELLS Would preserve hearing longer

Safer flow of food

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