动物排尿 z-bo 2020-08-17 466

　　According to the latest research by researchers, animals that take 20 seconds to urinate generally exceed 3 kg. Whether it is an elephant or a cat, it is the best time to urinate and effectively avoid predators. Georgia Institute of Technology conducted a survey on 32 animals and found that the bladder volume of an elephant is 3,600 times the volume of a cat's bladder (the elephant bladder is 18 liters, and the cat bladder is 5 ml). It was found that the animals had the same urination time. In fact, this work is very useful. It tells engineers how natural organisms use gravity to regulate the flow of liquids.

　　According to the research team, in fact, all animals weighing more than 3 kg have the same time to urinate. Associate researcher at Georgia Institute of Technology, David Hugh (David Hugh) said: Big. For example, the urethra of an elephant is 1 meter long. "

　　The pressure of urethral fluid is equal to the pressure of a pool of 1 meter deep. The flow rate of elephant urine is 4 meters per second, which is equivalent to the amount of water released by five shower heads per second. David explained that if an elephant has a short urethra, it takes longer to urinate and is vulnerable to sudden attacks by predators. This study shows that the flow of urine is controlled by bladder pressure caused by muscle contraction. This study was published in the proceedings of the National Academy of Sciences recently published. David and graduate student Patricia Young discovered that gravity quickly expels urine from the bladder of large animals, while gravity has little effect on small animals. Patricia said: "Small animal urine is a small drop. Because of its high viscosity and capillary force, it is like urinating in a space environment. Rats urinate less than 2 seconds, and bats emit within 1 second. Bat. It urinates less than "

　　Researchers observed the urination process of 16 animals at the zoo, and then watched 28 YouTube videos about animals urinating. The observed animals are elephants, including cows, horses, dogs, cats, etc. The more we observe, the more strongly we realize that this discovery is particularly important in engineering. "David said, "Animals are growing rapidly without external pressure. Facts have proved that it can solve the problem of liquid flow, which is a problem, not a waste of animal energy. "