Nokea
The epithelial type CORRECTLY matched with its occurrence is:
- A. Stratified squamous – tongue
- B. Simple columnar – corneal epithelium
- C. Transitional epithelium – Fallopian tube
- D. Pseudostratified columnar – the vocal cords
Correct Answer: A
Rationale: The correct answer is A: Stratified squamous - tongue. The tongue is lined with stratified squamous epithelium to protect against mechanical stress and abrasion due to its constant movement and exposure to food. Simple columnar epithelium lines the corneal epithelium. Transitional epithelium is found in the urinary system, not the Fallopian tube. Pseudostratified columnar epithelium is typically found in the respiratory tract, not the vocal cords.
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Which hormonal effect is noted during the menstrual cycle?
- A. Luteinizing hormone (LH) and follicle-stimulating hormone (FSH) secretion rise
- C. A negative feedback mechanism is exhibited by the anterior pituitary gland and ovaries.
- D. The posterior pituitary gland secretes LH.
Correct Answer: A
Rationale: The correct answer is A because during the menstrual cycle, LH and FSH secretion rise to stimulate ovarian follicle development and trigger ovulation. This process is crucial for maintaining the menstrual cycle. Choice B is incorrect as it is incomplete. Choice C is incorrect as negative feedback is primarily between the hypothalamus, pituitary gland, and ovaries, not just the anterior pituitary gland and ovaries. Choice D is incorrect because LH is primarily secreted by the anterior pituitary gland, not the posterior pituitary gland.
The phenotypic sex is determined by:
- A. At fertilization by the male gamete
- B. At fertilization by the female gamete
- C. Around 6-10 weeks of gestation by the SRY gene
- D. By the activity of the androgen hormones on the indifferent genitalia
Correct Answer: D
Rationale: Step-by-step rationale for why choice D is correct:
1. During early development, all embryos possess indifferent genitalia.
2. Androgen hormones, like testosterone, influence the differentiation of these structures.
3. The presence of androgen hormones leads to the development of male genitalia.
4. Lack of androgen results in the development of female genitalia.
5. This process occurs after fertilization, not during fertilization.
In summary, choice D is correct as the phenotypic sex is determined by the activity of androgen hormones on the indifferent genitalia post-fertilization.
Choices A and B are incorrect because sex determination occurs post-fertilization, not during fertilization.
Choice C is incorrect as the SRY gene typically plays a role in sex determination but is not the primary factor influencing the phenotypic sex.
Shortly before menstruation:
- A. Blood levels of estrogen and progesterone decrease
- B. Blood levels of estrogen and progesterone increase
- C. Blood levels of FSH stabilize
- D. The corpus luteum secretes progesterone
Correct Answer: A
Rationale: Before menstruation, blood levels of estrogen and progesterone decrease, leading to the shedding of the endometrium.
Which of the following is not part of the primary egg follicle?
- A. Germinal epithelium
- B. Oocyte
- C. Follicular cells
- D. All of the above are part of the primary egg follicle.
Correct Answer: A
Rationale: The germinal epithelium is not part of the primary egg follicle.
The pectoral girdle consists of the:
- A. Sternum and scapula
- B. Clavicle and scapula
- C. Sternum and clavicle
- D. Scapula and humerus
Correct Answer: B
Rationale: The correct answer is B: Clavicle and scapula. The pectoral girdle consists of the clavicle (collarbone) and the scapula (shoulder blade). The clavicle articulates with the sternum, providing a connection between the upper limb and the axial skeleton. The scapula forms the shoulder joint with the humerus. The sternum is part of the axial skeleton and not directly part of the pectoral girdle. The humerus is a bone of the upper arm and not part of the pectoral girdle. Therefore, the correct answer is B as it accurately represents the bones that make up the pectoral girdle.