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The mammalian dive response
The mammalian dive response
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On a cold September day of 2010, in Colorado, one of the coldest places in the U.S, 2 year old Gore Ottsen had fallen into icy cold water during a family trip to the Rocky Mountains. While his Mother was bathing his two baby siblings, Gore had slipped out through the back door. When his Mother had frantically realized he was no where in her sight, she immediately assembled a family search party to locate him. After 20 minutes passed by, Gore's Uncle Dave spotted Gore's body trapped under a log in a strong current irrigation ditch 350ft from the cabin. He was rushed to the closest hospital, where the doctor tried to resuscitate the child, but after being submerged for 25 minutes under water, the Ottsen family was told Gore had less than 1 percent change of surviving. The toddlers heart had stopped beating leaving the family devastated. However after almost an hour of having a non-beating heart, …show more content…
Gore was revived at the Denver Children’s Hospital and a few days later, he recovered completely leaving with a clean bill of health. This story borderlines between god given miracle, myth and impossible.
However I assure you it is 100% true, and it is not the first case. These experiences showcase the amazing ability of the humans body and how it can unconsciously protect us.
The reason baby Gore Ottsen survived is due to a evolutionary reflex called the mammalian diving reflex. This reflex is found in mammals such as dolphins and whales who cannot breathe underwater. These animals must come up to the surface to breathe and then carry their air with them as they swim. For example, sperm whales are able to dive deeper than 1000 meters and store up to 3000 liters of air before a dive. How can a mammal stay underwater for so long? Similar to baby Gore Ottsen, the mammalian diving reflex allowing them to stay submerged for extended periods of time.
The reflex is triggered by a physiological reaction to wet apnea, so submersion is necessary for this reaction to occur and cannot merely happen while holding you're breath. When a mammal is submerged, 2 things happen: vasoconstriction and heart rate
reduction. Humans, aquatic mammals and diving birds all portray vasoconstriction when submerged. Vasoconstriction is the reduction of blood flow due to the narrowing of blood vessels by muscle contraction in the walls of the blood vessel. This results to lower blood flow to peripheral organs, which do not need a lot oxygen to function, conserving blood and oxygen for the more essential organs of the body that need a substantially more amount of oxygen like the heart, lung and brain. Bradycardia, or heart rate reduction, is the second physiological reaction to occur during the mammalian diving reflex. This is an instant reflex that does not require full submersion in most humans, for example simply wetting the face is enough to drop the heart rate by 10-30%. Divers who have specifically trained their mammalian diving reflex are able to reduce their heart rate of up to 50%. However, the efficiency of bradycardia also depends on the temperature of the water in which one is submerged as the colder the water, the greater the heart rate reduction. Bradycardia helps conserve oxygen in the body longer, allowing oxygen to inhabit in the body and provide to the necessary organs for a longer period of time. Taking another look at the story, it can be understood that Gore survived due to the mammalian reflex during an icy cold submersion, and due to the temperature it lead to a greater heart rate reduction allowing his body to preserve and distribute needed oxygen by vasoconstriction to the rest of the body. Due to his small stature, he needed less oxygen than an adult, and was able to survive for 25 minutes underwater. Now as this is a reflex, everyone has a different reaction time explaining why not everyone that drowns survives. Gore Ottsen is a miracle story that shows us to appreciate our bodies for the things we can see it do, and the things we cant see it do. Our body is always working to keep surviving and it never takes a vacation.
Oxygen breathing lungs are a universal trait of class reptilia. As such, it would have been necessary for the Plesiosauroid - a marine reptile, to return to the ocean surface to inhale air. Oxygen expenditure in reptiles is proportional to strenuosity of locomotion (Frappell, Schultz & Christian, 2002). Therefore the Plesiosauroid must have held physiological traits that enabled the species to avoid oxygen deficit while hunting deep-sea dwelling prey. This essay will outline the hypothesised respiratory, circulatory, pulmonary and sensory attributes of the Plesiosauroid as they relate to diving. These hypotheses will be supported by investigating the physiological adaptations of the Plesiosaur’s biological analogues, and the prospect of similar adaptations in the former will be speculated upon.
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Marine mammals are able to suffer from decompression sickness, which is a condition that occurs when sudden decompression causes nitrogen bubbles to form in the blood and tissues of the body. The lifestyles of marine mammals makes them susceptible to this condition, however, they have adapted to overcome this obstacle. Many marine mammals are capable of storing gas in their trachea during dives. The trachea is reinforced by cartilage, which supports its structure during dives where the lungs collapse under pressure. This prevents the gas from being forced into the bloodstream, also preventing nitrogen from entering the blood. Increased myoglobin concentrations, increased blood volume, and decreased lung size relative to body size are also adaptations seen in diving mammals (Hooker et al., 2011).
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This reflex is also present in humans, although not to the same intense degree as seen in cold water native mammals, and not for the same reasons. Only in recent years have this reflex and the benefits it can provide in the survival of cold water drowning been observed and researched in humans. The focus of this paper is three-fold: first to explain the physiological process that is the mammalian diving reflex and how it is triggered; next the role the mammalian diving reflex plays in the survival of potential cold-water downers; thirdly, how doctors are using this reflex in the practice of modern medicine.
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There are two distinct groups of divers: shallow divers and deep divers (Costa, 2007). The majority of diving vertebrates make shallow, short dives. Sea snakes and crocodiles dive in near shore and only submerge at depths less than ten meters deep (Costa, 2007). Deep divers generally are underwater for extended periods of time (Costa, 2007). Emperor penguins dive at depths between 400 and 500 meters for 4 to 5 minutes to catch prey (Costa, 2007). Elephant seals are another group of animals that dive and travel long distances for periods lasting two to eight months (Costa, 2007). Elephant seals spend approximately 90% of their time at sea submerged, averaging 20 minutes per dive and they spend less than 3 minutes at the surface between dives (Costa, 2007). They feed at depths between 300 and 600 meters and occasionally dive down deeper than 1600 meters (Costa, 2007). Despite the vast differences between all of these animals, they all have evolved mechanisms that function similarly to overcome the physiological strains of diving. The two main diving strains are water pressure that occurs when an animal dives further under water and breath holding (Costa, 2007). These two things effect the mechanical functions of animals, and animals
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In news stories the world over there are cases of pets and occasionally humans that have fallen into icy lakes and been submerged for up to and over an hour. Often the human or pet will perish due to the cold temperature of the water but in some cases are pulled free and are resuscitated; surviving their ordeal and being effectively ‘restored’ from what is considered by normal standards certain death. The idea that conscious beings could survive such trauma is that the icy water lowers body temperature and places it into a state of suspended animation, slowing metabolism and brain function to levels where they require very little or no oxygen at all.