Structure and function of the dermis in general Structure; deep part of skin; connective tissue composed of two layers function; is responsible for the structural strength and flexibility of the skin; the epidermis exchanges gases nutrients and waste products with blood vessels in the dermis
My new answer: Usain Bolt acheived a top speed of 27.28 mph or 43.90 kph in travellng the 2 fastest consecutive 60-70 & 70-80, 10m splits ever of .82 seconds. We'll leave out 4x100m splits as I don't have them for Team Jamaica's WR from Beijing.
In 1983 Mike Boit of Kenya ran a mile in 3:28.36. As far as I know, no one has ever covered the distance faster. This was on a downhill road course so it isn't recognized by IAAF but it's still the fastest mile ever run by a human. The world record in the mile run is the best mark set by a male or female runner in the middle-distance track and field event.