본문의 내용과 일치하지 않는 것은? Within the human body flows a river unlike any other earthly river - a crimson stream that courses through every organ, twists past every cell on a journey that stretches sixty thousand miles, enough to circle the planet two and a half times. Earthly rivers refresh the land with water; the body's stream nourishes and cleanses, delivering food and oxygen to every cell, removing waste, regulating the human environment. Earth's rivers flow through inorganic rock and sand; the body's river travels through living tissue. The powerful heart that propels this stream and the vessels that guide it are all alive. The human river can regulate its own velocity, its banks widening or narrowing to control the shifting tides.