muscles

Scientists Made a ‘Fish’ From Human Cardiac Cells, And It Swims Like a Beating Heart

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With its tail flipping rhythmically from side to side, this strange synthetic fish scoots around in its salt and glucose solution, using the same power as our beating hearts. This nifty miniaturized circulatory system, developed by scientists at Harvard and Emory universities, can keep swimming to the beat for more than 100 days.   The … Read more

The Science Behind Why Some of Us Can’t Grow Big Muscles After Turning 50

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There is perhaps no better way to see the absolute pinnacle of human athletic abilities than by watching the Olympics. But at the Winter Games this year – and at almost all professional sporting events – you rarely see a competitor over 40 years old and almost never see a single athlete over 50.   … Read more

Fish Have ‘Talked’ For 155 Million Years, And Now You Can Hear Their ‘Voices’

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All manner of croaks, chirps, and deep trombone moans permeate Earth’s waters, just like the cacophony of sounds that fill its forest air. For example, reefs are surprisingly noisy places, and many of the noisemakers are fish.   “We’ve known for a long time that some fish make sounds, but fish sounds were always perceived as … Read more

How Gut Microbe Symbiosis Helps Squirrels Keep Their Muscles During Hibernation

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Ground squirrels spend the end of summer gorging on food, preparing for hibernation. They need to store a lot of energy as fat, which becomes their primary fuel source underground in their hibernation burrows all winter long.   While hibernating, ground squirrels enter a state called torpor. Their metabolism drops to as low as just … Read more

Hibernation: Dormant ground squirrels recycle urine to maintain their muscles

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Hibernating animals find it hard to get the nitrogen they need to maintain muscles – but ground squirrels have gut microbes that can break down urea to free up the nitrogen it contains Life 27 January 2022 By Alex Wilkins Hibernating thirteen-lined ground squirrel Robert Streiffer Hibernating ground squirrels stay in shape by recycling urea, … Read more