General functions of the integumentory system: Protection, sensation, temperature regulation, vitamin D production, Excretion: 3 Layers of skin: Epidermis- top, superficial, epithelial Dermis- deep layer of connective tissue Subcutaneous tissue- not part of skin, loose connective tissue that connects to underlying layers From deepest to most superficial, name and describe the five strata of epidermis
North American X-15. If the type of engine is not limited to jet-powered engines, then the North American X-15 is the fastest airplane. Powered by a rocket engine, the X-15 is said to have reached a speed of 4,520 miles (7,274 km) per hour. Like the X-43, it is launched mid-air from a B-52.
A scramjet (supersonic-combustion ramjet) is a ramjet engine in which the airflow through the whole engine remains supersonic. The highest speed attained by a rocket-powered airplane, NASA's X-15 aircraft, was Mach 6.7. The fastest air-breathing, manned vehicle, the SR-71, achieved slightly more than Mach 3. The X-43A more than doubled the top speed of the jet-powered SR-71.