Nokea
A zygote is
- A. the same as an ovum
- B. another name for secondary oocyte
- C. a diploid fertilized ovum
- D. the same as polar body
Correct Answer: C
Rationale: The correct answer is C: a diploid fertilized ovum. A zygote is formed when a sperm fertilizes an ovum, resulting in a diploid cell with a complete set of chromosomes. This marks the beginning of a new individual.
A) Incorrect: An ovum is a haploid cell produced by the female reproductive system.
B) Incorrect: A secondary oocyte is a haploid cell that has undergone meiosis II but has not been fertilized yet.
D) Incorrect: A polar body is a haploid cell that is produced during oogenesis and eventually disintegrates.
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What type of glands are the glands of Moll?
- A. Endocrine gland
- B. Apocrine sweat gland
- C. Oil gland
- D. Sebaceous glands
Correct Answer: B
Rationale: The glands of Moll are a type of apocrine sweat glands located in the eyelids. They secrete a clear fluid that helps lubricate the eyes. The correct answer is B because apocrine glands are associated with hair follicles and produce a thicker secretion compared to eccrine sweat glands. Endocrine glands (A) secrete hormones into the bloodstream, oil glands (C) are associated with hair follicles and produce sebum, and sebaceous glands (D) are also oil-producing glands but are different from the glands of Moll.
The uterus is located:
- A. in the pelvic cavity;
- B. posterior to the urinary bladder;
- C. anterior to rectum;
- D. above the vagina;
Correct Answer: A
Rationale: The correct answer is A: in the pelvic cavity. The uterus is a female reproductive organ situated in the pelvic cavity. It is where the fertilized egg implants and develops during pregnancy. The uterus is located between the bladder (anteriorly) and the rectum (posteriorly). Therefore, it is not posterior to the urinary bladder (B), anterior to the rectum (C), or above the vagina (D). The correct placement of the uterus in the pelvic cavity ensures proper support and function for reproduction.
When do the corona radiata cells appear?
- A. at birth
- B. 12 days
- C. 28 days
- D. 1 day
Correct Answer: A
Rationale: The corona radiata cells appear at birth because they are a crucial part of the ovum and are present as soon as the ovum is released from the ovary. The other choices are incorrect because corona radiata cells are not formed at 12, 28, or 1 day after birth. They are specifically associated with the ovum and its release during ovulation, making option A the most accurate.
If a radioimmunoassay is properly conducted and the amount of radioactive hormone bound to antibody is low, this would indicate which of the following?
- A. Plasma levels of endogenous hormone are high
- B. Plasma levels of endogenous hormone are low
- C. More antibody is needed
- D. Less radioactive hormone is needed
Correct Answer: A
Rationale: The correct answer is A: Plasma levels of endogenous hormone are high. When the amount of radioactive hormone bound to the antibody is low in a radioimmunoassay, it indicates that there is a high concentration of non-radioactive, endogenous hormone present in the sample competing for binding sites on the antibody. This competition results in fewer radioactive hormones binding to the antibody. Therefore, the low radioactive hormone binding suggests an abundance of non-radioactive hormone in the sample.
Choice B is incorrect because low levels of radioactive hormone binding do not indicate low plasma levels of endogenous hormone. Choice C is incorrect as more antibody wouldn't affect the binding of radioactive hormone if endogenous hormone levels are high. Choice D is incorrect because the amount of radioactive hormone needed is not related to the binding observed in the assay.
An embryo is known as a fetus during parturition? by the ________ week of pregnancy.
- A. Oxytocin increases
- B. first contractions of the uterus.
- C. second
- D. Oxytocin inhibits
Correct Answer: C
Rationale: The correct answer is C: second. An embryo is known as a fetus during parturition by the second week of pregnancy. This is because by the end of the eighth week of gestation, the embryo has developed all major organs and structures, transitioning to the fetal stage. Choice A is incorrect because oxytocin increases during labor, not by the second week of pregnancy. Choice B is incorrect as the first contractions of the uterus occur during labor, not during the second week of pregnancy. Choice D is incorrect as oxytocin actually promotes uterine contractions during labor.