When faced with a predator or sudden danger, the heart rate goes up, breathing becomes more rapid, and fuel in the form of glucose is pumped throughout the body to prepare an animal to fight or flee.
Cell & Microbiology
Sep 12, 2019
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82006
The idea of taking apart a rat's heart and transforming it into a tissue-engineered stingray first came to Kevin Kit Parker during a trip to the New England Aquarium with his daughter.
Robotics
Aug 8, 2016
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2819
Deprived of oxygen, naked mole-rats can survive by metabolizing fructose just as plants do, researchers report this week in the journal Science.
Plants & Animals
Apr 20, 2017
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9617
If you live in Georgia, it's hard not to notice the state's latest resident.
Plants & Animals
Mar 2, 2022
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Scientists from around the world are meeting in Washington this week to debate how best to proceed with research into gene-editing technology.
Biotechnology
Dec 3, 2015
1
731
Fireflies, heart cells, clocks, and power grids all do it—they can spontaneously sync up, sending signals out in unison. For centuries, scientists have been perplexed by this self-organizing behavior, coming up with theories ...
General Physics
Mar 7, 2019
0
2159
New research suggests sleepiness during virtual meetings is caused by mental underload and boredom. Earlier studies suggested that fatigue from virtual meetings stems from mental overload, but new research from Aalto University ...
Social Sciences
Oct 30, 2023
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116
A major problem with how food donation currently works in the United States is that a lot of the calories in those boxes and bags come from items that aren't particularly healthy, such as packaged snacks.
Social Sciences
Mar 23, 2022
0
38
In a forest in southern Chile, a giant tree has survived for thousands of years and is in the process of being recognized as the oldest in the world.
Ecology
Apr 22, 2023
0
301
Hibernating astronauts could be the best way to save mission costs, reduce the size of spacecraft by a third and keep crew healthy on their way to Mars. An ESA-led investigation suggests that human hibernation goes beyond ...
Space Exploration
Jan 31, 2022
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1616
The heart is a muscular organ in all vertebrates responsible for pumping blood through the blood vessels by repeated, rhythmic contractions, or a similar structure in annelids, mollusks, and arthropods. The term cardiac (as in cardiology) means "related to the heart" and comes from the Greek καρδιά, kardia, for "heart."
The heart of a vertebrate is composed of cardiac muscle, an involuntary striated muscle tissue which is found only within this organ. The average human heart, beating at 72 beats per minute, will beat approximately 2.5 billion times during a lifetime (about 66 years). It weighs on average 250 g to 300 g in females and 300 g to 350 g in males.
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