If a person's blood vessels to link up, about 150,000 kilometers long, you can circle around the Earth 4.
The nails were about 1.9 inches per year.
Human hair, there is an average of 200,000, about 1 minute per day 2 per cent annual average 1-foot 2-inch long 2 hours. A shaved head who left the root of the hair, the total length of 600 feet. The capacity of human blood volume of about I 1 / 4.
Middle-aged muscles about 40% of body weight, the muscle of young people about 25% of their body weight.
Physical normal adults, the frequency of breathing per minute, his pulse beat frequency of about 1 / 4, such as breathing 18 times per minute, then pulse about 72 times per minute.
People a total of 206 bones.
成年人的肠子,总长度约为本人身高的4倍；婴儿的肠子,长度有其身高的6倍。
如果把一个人的血管连接起来,约有15万公里长,可以绕地球4圈。
人的指甲每年约长1.9寸。
人的头发,平均每人有20万根,每天约长1分2厘,年均长1尺2寸2分。一个剃光头的人所留下的头发根,其总长度还有600尺。人的血液的容量约占本人体积的1/4。
中年人的肌肉约占全身重量的40％,青年人的肌肉约占其体重的25％。
体格正常的成年人,每分钟呼吸的次数约为他脉搏跳动次数的1/4,如每分钟呼吸18次,则脉搏跳动每分钟约为72次。
人身上总共有206根骨头。