Nokea
As menstruation ends estrogen levels in the blood rise rapidly. What is the source of the estrogen?
- A. Corpus luteum
- B. Developing follicles
- C. Endometrium
- D. Stromal cells of the ovaries
Correct Answer: B
Rationale: The correct answer is B: Developing follicles. After menstruation, the developing follicles in the ovaries produce estrogen. This estrogen is responsible for thickening the endometrium in preparation for potential implantation of a fertilized egg. The corpus luteum produces progesterone, not estrogen. The endometrium is the inner lining of the uterus and is not a direct source of estrogen. Stromal cells of the ovaries are supportive cells and do not produce estrogen.
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Shin bone is also known as
- A. Femur
- B. Tibia
- C. Fibula
- D. Patella
Correct Answer: B
Rationale: The correct answer is B: Tibia. The shin bone is commonly referred to as the tibia. This bone is located on the inner side of the leg and is the larger of the two lower leg bones. The femur (A) is the thigh bone, the fibula (C) is the smaller of the two lower leg bones, and the patella (D) is the kneecap. Therefore, the tibia is the correct answer as it specifically refers to the shin bone.
Approximately how many sperm are normal ejaculated during intercourse.
- A. 4,000
- B. 40,000
- C. 400,000,000
- D. 4,000,000
Correct Answer: C
Rationale: The correct answer is C: 400,000,000. During ejaculation, a healthy male typically releases around 200-500 million sperm cells. Choice A (4,000) and B (40,000) are too low compared to the average sperm count. Choice D (4,000,000) is also significantly lower than the typical sperm count, making it incorrect. Therefore, C is the correct answer as it aligns with the standard range of sperm count during ejaculation.
Endometrium
- A. Lined by simple columnar epithelium
- B. Stratum functionalis is shed during menstrual phase
- C. Forming decidua of placenta during pregnancy
- D. Is penetrated by arcuate artery
Correct Answer: B
Rationale: The correct answer is B: Stratum functionalis is shed during menstrual phase. The endometrium is composed of two layers - the stratum functionalis and the stratum basalis. The stratum functionalis is the layer that undergoes cyclic changes during the menstrual cycle, thickening and then shedding during menstruation. This process is essential for preparing the endometrium for potential implantation of a fertilized egg.
Choice A is incorrect because the endometrium is actually lined by simple columnar epithelium with ciliated cells. Choice C is incorrect because the decidua is the name for the endometrium during pregnancy, but it is not specific to forming the decidua of the placenta. Choice D is incorrect because the arcuate artery is a branch of the uterine artery that runs along the myometrium, not penetrating the endometrium directly.
Inflammation of vertebra is
- A. Spondylitis.
- B. Spondylolisthesis.
- C. Spondylosis.
- D. Spondylopathy
Correct Answer: A
Rationale: Rationale:
1. Spondylitis refers to inflammation of the vertebrae, making it the correct choice.
2. Spondylolisthesis is the anterior displacement of a vertebra, not inflammation.
3. Spondylosis is degenerative changes in the spine, not inflammation.
4. Spondylopathy is a general term for any spinal disease, not specific to inflammation.
Where does the ovum receive the sperm?
- A. Animal pole
- B. Vegetal pole
- C. Zona pellucida
- D. None of the above
Correct Answer: C
Rationale: The correct answer is C: Zona pellucida. The ovum receives the sperm in the zona pellucida, which is a glycoprotein layer surrounding the oocyte. Sperm must first penetrate this layer to fertilize the egg. Choices A and B (Animal pole and Vegetal pole) refer to different regions of the egg and are not directly involved in sperm-egg interaction. Choice D (None of the above) is incorrect because the zona pellucida is indeed where the sperm interacts with the ovum during fertilization.