Which factors would change during pregnancy if the hormone progesterone were withdrawn or reduced?
Insulin resistance would be increased.
Sweat and sebaceous glands would increase production.
Pyrosis would increase in frequency.
Peristalsis and uterine contractility would increase.
The Correct Answer is D
Peristalsis and uterine contractility would increase.
This is because progesterone is a hormone that relaxes the smooth muscles of the uterus and the gastrointestinal tract during pregnancy.
If progesterone were reduced or withdrawn, the uterus would contract more and peristalsis would increase, leading to possible preterm labor and digestive problems.
Choice A is wrong because insulin resistance would be decreased, not increased, by lower progesterone levels.
Progesterone increases insulin resistance during pregnancy to ensure adequate glucose supply for the fetus.
Choice B is wrong because sweat and sebaceous glands would decrease production, not increase, by lower progesterone levels.
Progesterone stimulates the activity of these glands during pregnancy to regulate body temperature and protect the skin from infections.
Choice C is wrong because pyrosis (heartburn) would decrease in frequency, not increase, by lower progesterone levels.
Progesterone relaxes the lower esophageal sphincter during pregnancy, allowing gastric acid to reflux into the esophagus and cause pyrosis.
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Correct Answer is B
Explanation
This change alters the center of gravity and posture of the body because the uterus expands and shifts higher as the fetus grows during pregnancy.
This causes an increased strain on the muscles and ligaments supporting the vertebral column and leads to lower back pain.
Choice A is wrong because increased joint laxity does not alter the center of gravity and posture of the body.
It is caused by hormonal changes that loosen the ligaments throughout the body, resulting in decreased stability of the joints.
Choice C is wrong because increased muscle strain does not alter the center of gravity and posture of the body.
It is a consequence of the shift in the center of gravity and the weight gain during pregnancy, which put more pressure on the back muscles.
Choice D is wrong because decreased muscle strength does not alter the center of gravity and posture of the body.
It is not a common musculoskeletal change during pregnancy, although some women may experience fatigue or weakness due to hormonal changes or anemia.
Correct Answer is D
Explanation
Prolactin is a hormone that is responsible for inhibiting ovulation and stimulating milk production during pregnancy.
It is produced by the anterior pituitary gland and increases throughout pregnancy.
Choice A is wrong because hCG (human chorionic gonadotropin) is a hormone that is produced by the placenta and maintains the corpus luteum, which secretes progesterone and estrogen.
hCG does not inhibit ovulation or stimulate milk production.
Choice B is wrong because progesterone is a hormone that is produced by the corpus luteum and the placenta and supports the endometrium, prevents uterine contractions, and prepares the breasts for lactation.
Progesterone does not inhibit ovulation or stimulate milk production.
Choice C is wrong because estrogen is a hormone that is produced by the corpus luteum and the placenta and stimulates uterine growth, blood flow, and breast duct development.
Estrogen does not inhibit ovulation or stimulate milk production.
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