Don Glass, Indiana University, Milk discussed on A Moment of Science

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The picture new parents cooing their baby on the couch. The baby's quiet and calm and everyone's that wrist so their heart rates are low maybe around sixty or seventy beats a minute for the adults. But what about the baby? How do you think? The baby's heart rate compares to the parents newborns have resting heart rates are on one hundred to one hundred fifty beats per minute way higher than that of adults. In fact, a newborn resting heart rate is in the ballpark of the target heart rate for an adult doing a heavy workout. What gives why do you Bornes hearts beat so much faster than adults part of the answer? Lies in the fact that babies grow so dramatically they burn food in every sell their bodies to fuel that growth. The process requires not only abundance of milk, but also oxygen and it produces large. Amounts of carbon dioxide as waste, maybe. Ours work overtime to keep supplying oxygen and removing carbon dioxide to fuel their amazing growth, but growth isn't the only factor because it's not just baby animals. We're talking about adult chihuahuas have much higher heart rates than adult elephants. Why chihuahuas have a greater surface to volume ratio? In other words, that you wanna has a greater proportion of skin than internal tissue. Which means it loses. More heat to the environment relatively speaking than a larger animal babies hearts be much faster than their parents both to fuel their growth and to make for greater heat loss to the environment. So little hearts maintain a higher metabolic rate pound for pound, then big hearts this moment. Science comes from Indiana University. I'm Don glass.

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