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.
The fastest time for running 100 m is about 9.8 s. So, someone running that fast would have run 100/9.8 m/s, or about 10.2 m/s, which is about 36.7 km/h. After taking acceleration into account, I would guess that the world's fastest person could run about 38-39 km/h.