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Where did all humans originate from?
a single cell
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How is the single cell that all humans are originated from formed?
when the egg and sperm unite (zygote)
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What is zygote?
when the egg and sperm unite
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What happens at Youth before birth?
before birth, the fetus develops all the organs and systems necessary for a functional body
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What happens at Youth after birth?
after birth, the infrant continues to mature and cells divide for growth.
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What happens at youth by adulthood?
cell division reduces to only occur during repear of tissues
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What happens with Aging?
losing tissue mass due to cell greatly decrease division rate and dead cells are replaced at a slower rate, tissue is lost, 7 weakening occurs.
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What are the 4 theories of aging?
free radical, mitochondrial, genetic, telomeres
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What is the free radical of aging?
molecules (primarily oxygen) that have an unpaired electron and are highly reactive. They build up and damage the cells. (Vit E & C are used to reduce radicals and thus reduce cell damage)
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What is the mitochondrial theory of aging?
the mitochondria produces free radicals as a result of cellular respiration due to high metabolism. Those that eat less or have a slow metabolism live longer because less radicals are produced by the mitochondria.
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What is the genetic theory of aging?
our genes have a predetermined life span for cells. This means that it is genetically predetermined how many times a cell divides and how long it will live. This indicates that aging is a normal part of human development.
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What is the telomeres of aging?
sections of DNA that do not contain genes, but influence the amount of times a cell divides. As the cells divide, the number of telomeres decreases, thus the cell will divide less often.
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