Nokea
Ectoderm, mesoderm, and endoderm are three tissue layers that are formed during _____________ stage.
- A. morula
- B. blastula
- C. gastrula
- D. neurula
Correct Answer: C
Rationale: The correct answer is C: gastrula. During the gastrula stage of embryonic development, the blastula undergoes a process called gastrulation, where the three primary germ layers - ectoderm, mesoderm, and endoderm - are formed. The ectoderm gives rise to the nervous system and skin, the mesoderm forms muscles and organs, and the endoderm develops into the lining of the digestive tract and respiratory system. Morula (A) is an earlier stage where the zygote divides into multiple cells. Blastula (B) is the stage before gastrula where a hollow ball of cells is formed. Neurula (D) is a stage specific to vertebrate embryos where the neural tube begins to form.
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After a rectal examination of a patient with obstructive jaundice, the nurse expects the stool to be what color?
- A. Tan
- B. Pale yellow
- C. Black
- D. Bright red
Correct Answer: A
Rationale: The correct answer is A: Tan. In obstructive jaundice, there is a blockage in the bile ducts, leading to reduced bile flow into the intestines. As a result, stool color changes to tan or clay-colored due to the absence of bile pigments. Pale yellow is incorrect as it suggests some bile flow. Black stool indicates upper gastrointestinal bleeding. Bright red stool indicates lower gastrointestinal bleeding.
Which of these is not produced by the placenta?
- A. estrogen
- B. relaxin
- C. progesterone
- D. lactogen
Correct Answer: B
Rationale: The correct answer is B: relaxin. The placenta produces estrogen, progesterone, and lactogen to support pregnancy. Relaxin is primarily produced by the corpus luteum and later by the placenta. However, it is not exclusively produced by the placenta, making it the correct choice. Estrogen is crucial for fetal development and maintaining pregnancy. Progesterone helps in preparing the uterus for implantation and supporting the pregnancy. Lactogen (human placental lactogen) plays a role in regulating maternal metabolism and fetal growth.
A major function of FSH is to
- A. stimulate the development of the gonads during early development.
- B. stimulate spermatogenesis in males and oocytes maturation in females.
- C. increase the secretion of testosterone by the testes.
- D. regulate the secretion of the bulbourethral gland
Correct Answer: B
Rationale: The correct answer is B because FSH, or Follicle-Stimulating Hormone, stimulates spermatogenesis in males and oocyte maturation in females. In males, FSH acts on the Sertoli cells in the testes to promote the development of sperm cells. In females, FSH stimulates the growth and maturation of ovarian follicles, leading to the release of mature eggs.
Choice A is incorrect because FSH is not primarily responsible for the development of gonads during early development. Choice C is incorrect because FSH does not directly increase the secretion of testosterone by the testes; that is the role of LH (Luteinizing Hormone). Choice D is incorrect because FSH does not regulate the secretion of the bulbourethral gland; that is controlled by other hormones.
Her Hemovac has drained 60 ml postoperative day 1, 55 ml postoperative day 2, and 40 ml thus far today. She asks you when will the drain be removed. Which would be the most appropriate response?
- A. It will be removed the day you go home.'
- B. Usually the doctor waits until the drainage subsides or stops altogether.'
- C. I'm surprised the doctor didn't take it out by now.'
- D. If you ask your doctor maybe he'll take it out next time he comes in.'
Correct Answer: B
Rationale: The drain is usually removed once the drainage subsides or stops, indicating proper healing.
Mrs. Harden is being prepared for discharge and anticipates outpatient radiation therapy for cancer of the cervix. Which information should be included in her discharge teaching plan?
- A. Maintaining intake and output records
- B. Applying ointment to irradiated areas
- C. Reporting redness, desquamation, and telangiectasis to her radiologist
- D. Maintaining a vigorous exercise program
Correct Answer: C
Rationale: Reporting skin changes to the radiologist ensures timely management of radiation side effects.