The P wave indicates atrial depolarization. The P wave occurs when the sinus node, also known as the sinoatrial node, creates an action potential that depolarizes the atria.
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In ovulation, after expelling the oocyte the follicle becomes a corpus luteum, estrogen and secretes progesterone.
<h3>What is corpus luteum?</h3>
- corpus luteum, yellow hormone-secreting body in the female reproductive procedure. It is created in an ovary at the site of a follicle, or sac, that has developed and released its ovum, or egg, in the procedure known as ovulation.
- Although it's inside your ovaries, the corpus luteum job is to create your uterus a healthy residence for a fetus to grow. It releases a hormone called progesterone that organizes your uterus for pregnancy. Once it's no longer needed to make progesterone, your corpus luteum goes away.
- Having a corpus luteum cyst doesn't indicate that you're pregnant. Your doctor is more possible to find one if you're pregnant, though, because they typically show up during the imaging techniques that happen with pregnancy.
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Answer: d. Confounding
Explanation:
In the context of a scientific study such as this one, a confounding factor is one that has influence on both the exposure and event variable(s), which may lead to over- or underestimation of the direct relationship between them (if any).
For instance: In this example, researchers may have had reason to believe that male gender is associated with both higher risk of obesity (the exposure variable) and adult-onset asthma (the event variable). If gender is not taken into account, one may claim that the finding of an association between obesity and asthma is simply an artifact due to the high proportion of male patients (likely to present with both). <em>Controlling</em> for that variable (such as by matching, as in this example) allows researchers to test for this hypothesis.