Answer:
Serotonin is thought to be the underlying neurotransmitter involved in migraine, based on a lower than normal level of serotonin (5-HT) which increases during attacks.
Answer:
Antibodies are produced by __type B__ lymphocytes; cell-mediated immunity is provided by __type T__ lymphocytes.
Answer:
it reduces your risk of cancer of the ovaries, womb and colon. it can reduce symptoms of PMS (premenstrual syndrome) it can sometimes reduce acne. it may protect against pelvic inflammatory disease.
Explanation:
Advantages of hormonal methods of birth control include that they are all highly effective and their effects are reversible. They do not rely on spontaneity and can be used in advance of sexual activity.
Answer:
Products that the consumer could've bought instead of the cigarettes
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.