The study, published in the journal "Science," found that these mammals have evolved a unique adaptation that allows them to tolerate high levels of nitrogen gas in their tissues without experiencing the harmful effects of decompression sickness.
Decompression sickness occurs when gas bubbles form in the body's tissues due to a rapid reduction in pressure, such as when a diver ascends too quickly from a deep dive. These bubbles can block blood vessels and cause a variety of symptoms, including pain, paralysis, and even death.
To understand how marine mammals avoid decompression sickness, the researchers studied the diving behavior and physiology of Weddell seals and elephant seals. They found that these seals have a high tolerance to nitrogen gas, and that their blood and tissues are able to hold much more nitrogen than those of humans.
The researchers also found that seals have a unique adaptation called a "rete mirabile," which is a network of blood vessels that helps to exchange gases between the lungs and the rest of the body. The rete mirabile acts as a "nitrogen sink," helping to store nitrogen gas in the blood and prevent it from forming bubbles.
The study's findings provide new insights into the extraordinary diving abilities of marine mammals and could have implications for human diving safety. By understanding how seals and dolphins avoid decompression sickness, scientists may be able to develop new techniques to protect human divers from this dangerous condition.
