In Superhuman Body, James Garrett realized something was wrong when he started getting tired and needed to rest more often.
Eventually he learned that he had aortic stenosis, which meant enough blood wasn’t getting pumped to the rest of his muscles and organs to keep his body working properly. Engineers designed a valve to help his heart pump blood efficiently again.
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Use observations to describe patterns of what plants and animals (including humans) need to survive.
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Read texts and use media to determine patterns in behavior of parents and offspring that help offspring survive.