Nokea
The clinic nurse is reviewing breastfeeding with a pregnant patient. Which hormone will the nurse explain is responsible for milk production after the birth of the placenta?
- A. Pitocin
- B. Prolactin
- C. Estrogen
- D. Progesterone
Correct Answer: B
Rationale: The correct answer is B: Prolactin. Prolactin is the hormone responsible for milk production after the birth of the placenta. It stimulates the alveoli in the breast to produce milk. Pitocin (A) is responsible for uterine contractions. Estrogen (C) and progesterone (D) are involved in pregnancy maintenance but do not directly stimulate milk production.
You may also like to solve these questions
Menstruation occurs because the:
- A. Hormone stimulation from the corpus luteum ceases.
- B. Blood vessels in the uterine lining become too long and twisted.
- C. Corpus luteum increases estrogen and progesterone production.
- D. Ovum has been passed from the woman's body.
Correct Answer: A
Rationale: When the corpus luteum degenerates, progesterone and estrogen levels drop, causing the uterine lining to shed.
In humans, the meiotic phase with the longest duration is:
- A. Anaphase I in males
- B. Prophase II in males
- C. Prophase I in females
- D. Anaphase II in females
Correct Answer: C
Rationale: The correct answer is C: Prophase I in females. Prophase I is the longest phase in meiosis due to the process of genetic recombination and crossing over. This phase involves pairing of homologous chromosomes, exchange of genetic material, and formation of chiasmata. These complex processes contribute to the extended duration of Prophase I.
Incorrect choices:
A: Anaphase I in males - Anaphase I is a relatively short phase where homologous chromosomes separate.
B: Prophase II in males - Prophase II is shorter than Prophase I as it involves the formation of new spindles and nuclear envelope breakdown.
D: Anaphase II in females - Anaphase II is also a short phase where sister chromatids separate.
The bone cell type that breaks down the bone matrix is:
- A. Osteocytes
- B. Osteoclasts
- C. Osteoblasts
- D. Osteoprogenitor
Correct Answer: B
Rationale: The correct answer is B: Osteoclasts. Osteoclasts are bone cells responsible for breaking down the bone matrix through a process called bone resorption. They secrete enzymes and acids that dissolve the mineralized matrix, allowing for bone remodeling and repair. Osteocytes (A) are mature bone cells that help maintain bone tissue. Osteoblasts (C) are responsible for bone formation by synthesizing new bone matrix. Osteoprogenitor cells (D) are undifferentiated cells that can differentiate into osteoblasts. Therefore, the correct answer is B as osteoclasts specifically break down the bone matrix.
The posterior ligament forms a deep pouch known as the perineal body.
- A. TRUE
- B. FALSE
- C. NA
- D. NA
Correct Answer: B
Rationale: The posterior ligament forms the posterior cul-de-sac of Douglas, not the perineal body.
Which of the following uterine ligaments form a deep pouch known as the posterior cul-de-sac of Douglas?
- A. Broad
- B. Uterosacral
- C. Posterior
- D. Anterior
Correct Answer: C
Rationale: The posterior ligament forms the posterior cul-de-sac of Douglas.