Nokea
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.
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Mammary papilla means the;
- A. Areola
- B. Lactiferous duct
- C. Sinuses
- D. Nipple
Correct Answer: D
Rationale: The correct answer is D: Nipple. The mammary papilla refers to the nipple, the protruding part of the breast where milk is released during breastfeeding. It is the anatomical structure that connects the lactiferous ducts to the outside of the body. The other choices are incorrect because:
A: Areola is the darker area surrounding the nipple.
B: Lactiferous duct is the tube that carries milk from the mammary glands to the nipple.
C: Sinuses are not directly related to the mammary papilla.
The spermatozoon contains:
- A. 11 pairs of somatic chromosomes;
- B. one sexual chromosome;
- C. the X sex chromosome;
- D. the Y sex chromosome;
Correct Answer: D
Rationale: The correct answer is D because the spermatozoon contains the Y sex chromosome, determining male characteristics. Sperm cells are haploid and carry only one set of chromosomes, including either an X or Y sex chromosome. The presence of the Y chromosome leads to the development of male offspring. Choice A is incorrect as sperm cells do not contain somatic chromosomes. Choice B is incorrect as sperm cells contain one pair of sex chromosomes, not just one. Choice C is incorrect because sperm cells can carry either the X or Y sex chromosome, not specifically the X chromosome.
People lacking melanocytes are deaf. These cells function as part of:
- A. Hair cells
- B. modiolus
- C. spiral limbus
- D. stria vascularis
Correct Answer: D
Rationale: The correct answer is D: stria vascularis. Melanocytes are present in the stria vascularis of the cochlea, which is essential for maintaining the endocochlear potential and supporting the function of the hair cells. Without melanocytes, the stria vascularis cannot maintain the proper ion balance necessary for hearing, leading to deafness.
A: Hair cells are responsible for converting sound vibrations into electrical signals and are not directly related to melanocytes.
B: The modiolus is a bony structure in the cochlea that houses the spiral ganglion, which transmits signals from the hair cells to the brain. It is not directly involved with melanocytes.
C: The spiral limbus is a structure in the cochlea that supports the organ of Corti and is not directly related to melanocytes.
A male client is having trouble with erections and comes to the clinic to be seen by the doctor. The doctor diagnoses the client with erectile dysfunction. The nurse provides education regarding the disorder and teaches the client that erectile dysfunction can be caused by which of the following?
- A. Obsessive compulsive disorder
- B. Complications of STIs
- C. Side effects of drug therapy
- D. Spinal stenosis
Correct Answer: C
Rationale: Drug side effects are a common cause of erectile dysfunction.
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.