Hi.
<span>When a muscle is stretched by a contraction of the opposing muscles, it is called active stretching.
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Estrogen is at a low point. Therefore, the pituitary secretes FSH and LH, a process which actually begins before the onset of your menses. These hormones in turn stimulate the growth of several ovarian follicles, each containing one egg.
Blood in the pulmonary vein is oxygen rich, while in all of the other veins, it is oxygen poor.
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