Natural Wonders & Evolution: grizzly bear hibernation (Evolution)

by David Turell @, Monday, December 30, 2019, 17:33 (300 days ago) @ David Turell

How did this evolve by chance. There is no way a b ear could try going to sleep for months and survive without preparation by a designer:

https://phys.org/news/2019-12-learning-from-the-bears.html

"Grizzly bears spend many months in hibernation, but their muscles do not suffer from the lack of movement.

"A grizzly bear only knows three seasons during the year. Its time of activity starts between March and May. Around September the bear begins to eat large quantities of food. And sometime between November and January, it falls into hibernation. From a physiological point of view, this is the strangest time of all. The bear's metabolism and heart rate drop rapidly. It excretes neither urine nor feces. The amount of nitrogen in the blood increases drastically and the bear becomes resistant to the hormone insulin.

"A person could hardly survive this four-month phase in a healthy state. Afterwards, he or she would most likely have to cope with thromboses or psychological changes. Above all, the muscles would suffer from this prolonged period of disuse. Anyone who has ever had an arm or leg in a cast for a few weeks or has had to lie in bed for a long time due to an illness has probably experienced this.

"Not so the grizzly bear. In the spring, the bear wakes up from hibernation, perhaps still a bit sluggish at first, but otherwise well. Many scientists have long been interested in the bear's strategies for adapting to its three seasons.


***

"For me, the beauty of our work was to learn how nature has perfected a way to maintain muscle functions under the difficult conditions of hibernation," says Mugahid. "If we can better understand these strategies, we will be able to develop novel and non-intuitive methods to better prevent and treat muscle atrophy in patients."
( my bold)

***

"As the researchers reported in the journal Scientific Reports, they found proteins in their experiments that strongly influence a bear's amino acid metabolism during hibernation. As a result, its muscle cells contain higher amounts of certain non-essential amino acids (NEAAs)."

Comment: Non-essential amino acids are an interesting observation. They must have been designed just for this very special process and therefore are required to be in these bears. There are 20 essential amino acids that are left-handed and must be present for life to exist. It is not known if these special proteins exist anywhere else. The grizzly DNA requires this behavior to happen each year. Bears did not just decide to require this process. Note my bold: "Nature perfected a way". Pure Darwin illogical thinking. How about a designer!


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