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 animal on earth, relative to body length, is the South Californian mite Paratarsotomus macropalpis, which has a speed of 322 body lengths per second. The equivalent speed for a human running as fast as this mite would be 1,300 mph (2,092 km/h).