Women have a tendency to retain water during part of the menstrual cycle because estrogen mimics the action of what?
ADH
Natriuretic peptide
Oxytocin
Aldosterone
The Correct Answer is D
A. ADH (antidiuretic hormone) promotes water retention by increasing water reabsorption in the kidneys. Estrogen does not mimic the action of ADH.
B. Natriuretic peptide promote sodium excretion, which leads to water loss, not retention. Estrogen does not mimic this action.
C. Oxytocin is primarily involved in labor and lactation, not water retention. Estrogen does not mimic oxytocin's effects.
D. Aldosterone promotes sodium and water retention by increasing sodium reabsorption in the kidneys. Estrogen can mimic the action of aldosterone, leading to water retention during certain phases of the menstrual cycle.
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Correct Answer is C
Explanation
A. The neural tube and yolk sac have formed: By 8 weeks, the neural tube and yolk sac have formed, but this is not the criterion for defining a fetus.
B. The amniotic cavity has formed: The formation of the amniotic cavity occurs earlier in development and is not the defining feature of a fetus.
C. All of the organ systems are present: By the end of 8 weeks, the basic structures of all major organ systems are present, which is why the embryo is referred to as a fetus from this point onwards.
D. The mesoderm has formed: The formation of the mesoderm occurs earlier and is not the defining factor for fetal status. By 8 weeks, more significant development, including the presence of organ systems, has occurred.
Correct Answer is D
Explanation
A. Wolffian refers to structures related to the male reproductive system during embryonic development, not to uterine contractions.
B. Masters Johnson: Masters and Johnson are known for their research in human sexual response, not for describing types of uterine contractions.
C. Graafian: Graafian refers to a mature ovarian follicle, which is unrelated to uterine contractions.
D. Braxton Hicks: Braxton Hicks contractions are irregular, non-labor contractions of the uterus often referred to as "false labor."