The hormone that works with estrogen to prepare the endometrium for implantation of a fertilized egg is

Correct Answer: D

Rationale: Progesterone is the correct answer because it is the hormone that works with estrogen to prepare the endometrium for implantation of a fertilized egg. Progesterone helps thicken the endometrium, creating a favorable environment for implantation. LH and FSH are involved in ovulation and follicle development, not endometrial preparation. ADH is antidiuretic hormone, which regulates water balance in the body, not related to endometrial preparation.

Correct Answer: B

Rationale: Correct Answer: B - Her luteinizing hormone secretion rate will be totally suppressed Rationale: 1. The tumor secretes large amounts of estrogen, which can lead to negative feedback on the hypothalamus and pituitary gland. 2. Luteinizing hormone (LH) is crucial for ovulation and normal menstrual cycles. 3. High estrogen levels can suppress LH secretion, disrupting ovulation and menstrual cycles. Summary of other choices: A: Progesterone levels may actually be elevated due to the tumor-induced high estrogen levels. C: The disruption of LH secretion can lead to abnormal menstrual cycles. D: High estrogen levels can lead to bone loss due to inhibition of bone formation and increased bone resorption.

Correct Answer: B

Rationale: The correct answer is B: The fetal liver stores enough iron to meet the infant’s needs until the third month. During pregnancy, the fetus accumulates iron stores in the liver from the mother, which can sustain the infant's iron needs for the first few months of life. This stored iron is gradually utilized by the infant as the maternal iron supply diminishes post-birth. Explanation of why the other choices are incorrect: A: Growth of the infant does require iron even in the early months for various metabolic processes and functions. C: Synthesis of new red blood cells starts shortly after birth, not necessarily after 3 months. D: Myoglobin is not directly related to iron supplementation needs in infants and is unrelated to the timing of iron supplementation requirements.

Correct Answer: C

Rationale: Step 1: Maternal and fetal adrenal glands secrete androgenic steroids. Step 2: Placenta uses these androgenic steroids to form estrogen. Step 3: Increased estrogen levels can lead to body hair growth. Therefore, the correct answer (C) is supported by the process of androgenic steroids being secreted by the adrenal glands, utilized by the placenta to form estrogen, resulting in increased body hair growth. Summary: A (The ovaries secrete some testosterone along with estrogen) is incorrect as testosterone is not primarily secreted by the ovaries late in pregnancy. B (The fetal ovaries and testes secrete androgenic steroids) is incorrect as the primary source of androgenic steroids in this context is the adrenal glands, not fetal ovaries or testes. D (The placenta secretes estrogen, some of which is metabolized to testosterone) is incorrect as the main source of estrogen in this scenario is from the and

Correct Answer: A

Rationale: The correct answer is A: Sperm. Sperm is the mature male reproductive cell capable of fertilizing an egg. It carries genetic material and is designed for the process of fertilization. Spermatid (B) is an immature sperm cell not yet capable of fertilizing an egg. Primary spermatocyte (C) is a cell undergoing meiosis to produce spermatids. Spermatogonium (D) is a stem cell that gives rise to spermatocytes but is not directly involved in fertilization. Therefore, only sperm (A) is suitable for fertilizing an egg.