Health, 02.01.2020 07:31 hkcapricorn7705
Why does th e heart automatically adjust the flow to match activity levels? a. extreme actvity damages blood cellsand the body needs replacements b. the heart requires more oxygen when excersing c. it builds upahigher level of oxyge int he blood d. organs and musclesrequire moreblood under stress
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By 2 weeks after fertilization the morula has implanted into the uterine lining and transforms into a(n) . this time is when the , or the organ that will provide nourishment to the fetus by exchanging nutrients and waste products, begins to develop.
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Why does th e heart automatically adjust the flow to match activity levels? a. extreme actvity dama...
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