Nokea
Which blood vessel in the fetus has the highest Po2?
- A. Ductus arteriosus
- B. Ductus venosus
- C. Ascending aorta
- D. Left atrium
Correct Answer: B
Rationale: The correct answer is B: Ductus venosus. The ductus venosus carries oxygenated blood from the umbilical vein to the inferior vena cava, bypassing the liver. This blood has the highest Po2 among the choices because it is coming directly from the placenta, where oxygen exchange occurs. The other choices (A, C, D) carry deoxygenated blood or blood with lower oxygen content in the fetal circulation. The ductus arteriosus shunts blood from the pulmonary artery to the aorta, so it carries deoxygenated blood. The ascending aorta and left atrium receive mixed oxygenated and deoxygenated blood, not the highest Po2.
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Which patient does the nurse recognize as having the highest risk for ovarian cancer?
- A. A 24-year-old nulliparous woman who has a history of multiple sexual partners
- B. A 32-year-old woman who has had six live births and a history of human papilloma virus (HPV) infection
- C. A 55-year-old woman who reached menarche at age 12 and menopause at age 54
- D. A 64-year-old nulliparous woman who has taken hormone replacement therapy for 8 years
Correct Answer: D
Rationale: The correct answer is D because the patient is a 64-year-old nulliparous woman who has taken hormone replacement therapy for 8 years. Nulliparity (never giving birth) and prolonged use of hormone replacement therapy are both risk factors for ovarian cancer. Age is also a significant risk factor for ovarian cancer, with the highest incidence in women over 60.
Choice A is incorrect because although having multiple sexual partners may increase the risk of certain sexually transmitted infections, it is not a direct risk factor for ovarian cancer.
Choice B is incorrect because while HPV infection is associated with cervical cancer, it is not a known risk factor for ovarian cancer.
Choice C is incorrect because the age of menarche and menopause are not directly linked to an increased risk of ovarian cancer.
In summary, the correct answer, D, combines the highest risk factors for ovarian cancer, which are nulliparity, prolonged hormone replacement therapy, and older age.
Identify the CORRECT strategy to achieve external fertilization.
- A. Female organism will modify its body parts to receive male gametes.
- B. Fertilization must occur at night to avoid predators.
- C. Eggs and sperm must be shed simultaneously into water.
- D. The release of eggs is more frequent than the release of sperm.
Correct Answer: C
Rationale: The correct strategy for external fertilization is to have eggs and sperm shed simultaneously into water. This allows the gametes to meet and fertilize outside of the organism's body. This method is effective in aquatic environments where the chances of gametes coming into contact are increased. Choice A is incorrect as it describes internal fertilization. Choice B is irrelevant to the process of external fertilization. Choice D is incorrect as the frequency of egg and sperm release does not determine the success of external fertilization.
The child's sex is determined by:
- A. the type of the spermatozoon that fecundates the ovule;
- B. the type of the fecundated ovule;
- C. the sex chromosome of the ovule;
- D. the sex chromosome of the spermatozoon
Correct Answer: D
Rationale: The correct answer is D because the sex of the child is determined by the sex chromosome carried by the spermatozoon that fertilizes the ovule. Sperm carries either an X or a Y chromosome, determining if the child will be male (XY) or female (XX). Choices A and B are incorrect because the type of spermatozoon or ovule does not solely determine the child's sex. Choice C is incorrect as well because the sex chromosome of the ovule alone does not determine the child's sex.
When developing the plan of care for a home health client who has been discharged after a radical prostatectomy, which activities will you delegate to the home health aide?
- A. Monitor the client for symptoms of urinary tract infection.
- B. Help the client to connect the catheter to the leg bag.
- C. Assess the client's incision for appropriate wound healing.
- D. Assist the client to ambulate for increasing distances.
Correct Answer: D
Rationale: Assisting with mobility is within the scope of practice for a home health aide.
The nurse monitors a client who has gone through an endoscopic examination. Following a culdoscopy, what does a nurse need to observe for in this client?
- A. The nurse observes the client for any discomfort in the shoulders.
- B. The nurse observes the client for the signs of internal bleeding and the symptoms of shock.
- C. The nurse observes the client for changes in skin color and for any rise in body temperature.
- D. The nurse observes the quantity and frequency of urinary output.
Correct Answer: A
Rationale: Discomfort in the shoulders is a common side effect after culdoscopy due to gas insufflation.