Nokea
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.
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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.
When sexual feelings occur, it is important to
- A. consciously choose to act responsibly
- B. go to a quiet place and talk about what you are feeling with your partner
- C. explore the feelings and do what feels best
- D. see a doctor
Correct Answer: A
Rationale: The correct answer is A because it emphasizes the importance of consciously choosing to act responsibly when sexual feelings arise. This involves considering the consequences, respecting boundaries, and making informed decisions. Going to a quiet place to talk (B) may not address responsible actions. Exploring feelings and doing what feels best (C) may lead to impulsive or harmful choices. Seeing a doctor (D) is not necessary for regular sexual feelings. A conscious and responsible approach promotes healthy relationships and personal well-being.
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.
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.
When a male is castrated before puberty, he becomes:
- A. Female
- B. Cretin
- C. Eunuch
- D. Potent
Correct Answer: C
Rationale: The correct answer is C: Eunuch. When a male is castrated before puberty, he becomes a eunuch because castration removes the testes, leading to a lack of testosterone production and loss of male secondary sexual characteristics. This results in a eunuch having a more neutral appearance and lacking the ability to reproduce.
A: Choosing "Female" is incorrect because castration does not change the individual's genetic sex.
B: Selecting "Cretin" is incorrect as cretinism is a condition caused by severe thyroid hormone deficiency, not related to castration.
D: Opting for "Potent" is incorrect as castration leads to the loss of reproductive ability, making the individual infertile.