Which of the following provides fetal nutrition and secretes hormones that regulate pregnancy and fetal development
The endometrium
The placenta
The blastocyst
The myometrium
The Correct Answer is B
A. The endometrium is the inner lining of the uterus that supports the embryo after implantation, but it does not provide direct fetal nutrition or secrete hormones for fetal development.
B. The placenta is the organ that provides fetal nutrition, gas exchange, and waste removal. It also secretes hormones such as human chorionic gonadotropin (hCG), progesterone, and estrogen, which are essential for maintaining pregnancy and supporting fetal development.
C. The blastocyst is the early stage of the embryo that implants into the endometrium, but it does not provide fetal nutrition or secrete pregnancy-regulating hormones.
D. The myometrium is the muscular layer of the uterus responsible for contractions during labor, but it does not provide fetal nutrition or secrete hormones.
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Correct Answer is A
Explanation
A. The cardiovascular system is primarily involved in transporting blood and nutrients but does not directly excrete waste.
B. The respiratory system: The respiratory system helps excrete carbon dioxide, a waste product of metabolism.
C. The digestive system excretes waste through the process of defecation.
D. The integumentary system (skin) excretes waste through sweat.
E. The urinary system is directly involved in the excretion of waste products through urine.
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."