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.
For the curious, Bolt's world-record 9.58-second 100 meters would be a 3.50 40 when converted in the same manner. In 1986, when Jackson ran his combine 40, Calvin Smith was the world's fastest human, and his world-record 100-meter time of 9.93 seconds would be 3.63 seconds when reduced to 40 yards.