Nokea
An egg that has been fertilized by a sperm is called a _______________.
- A. implatation
- B. zygote
- C. embryo
- D. Breast
Correct Answer: B
Rationale: The correct answer is B: zygote. After fertilization, when the sperm and egg unite, they form a zygote. This is the initial stage of a new organism's development. Implantation (A) occurs when the embryo attaches to the uterus. Embryo (C) is the term for the developing organism after the zygote stage. Breast (D) is not related to the fertilization process. In this context, zygote is the most appropriate term as it specifically refers to the newly formed cell after fertilization.
You may also like to solve these questions
The clusters of specific glands that cycle are known as ________. produce milk when a woman is
- A. the menstrual phase lactating are called _______.
- B. the secretory phase
- C. lactiferous ducts
- D. menses
Correct Answer: B
Rationale: The correct answer is B: the secretory phase. During the secretory phase of the menstrual cycle, the glands in the breast tissue prepare for potential milk production. This phase occurs after ovulation when the body is getting ready for a possible pregnancy. The other choices are incorrect because:
A: the menstrual phase refers to the shedding of the uterine lining, not the breast glands.
C: lactiferous ducts are the tubes that carry milk from the glands to the nipple, not the clusters of glands themselves.
D: menses refers to the menstrual bleeding period, not the phase in which the breast glands are active for milk production.
Regarding the function of placenta
- A. The foetal blood is separated from maternal body by placenta barrier which is composed of 4 layers.
- B. The placental barrier allows the passage of IgG antibodies.
- C. Progesterone induces preterm labour
- D. Rate of oxygen and carbon dioxide diffusion depends on pressure gradient
Correct Answer: B
Rationale: Step 1: The placental barrier is semi-permeable, allowing small molecules like oxygen and nutrients to pass but blocking larger molecules like antibodies.
Step 2: IgG antibodies are the only type that can cross the placenta through active transport mechanisms.
Step 3: This transfer provides passive immunity to the fetus.
Step 4: Options A, C, and D are incorrect as the placenta has 4 main layers, progesterone does not induce preterm labor, and gas diffusion depends on concentration gradients, not pressure gradients.
Which structure helps regulate the temperature of the testes?
- A. Dartos muscle
- B. Tunica vaginalis
- C. Tunica albuginea
- D. Seminiferous tubules
Correct Answer: A
Rationale: The correct answer is A: Dartos muscle. The Dartos muscle is a layer of smooth muscle in the scrotum that contracts and relaxes to regulate the temperature of the testes by adjusting their distance from the body for temperature control. The other choices are incorrect because:
B: Tunica vaginalis is a serous membrane that surrounds the testes, providing support and lubrication.
C: Tunica albuginea is a dense fibrous membrane that covers the testes, providing structural support.
D: Seminiferous tubules are the site of sperm production in the testes, but do not play a direct role in temperature regulation.
Why is rupturing of the hymen not considered a confirmation of loss of virginity?
- A. Because the hymen is not affected by any sexual activity
- B. Because the hymen can be perforated during physical activity, insertion of a tampon, or pelvic examination.
- C. Because the hymen is ruptured the first time a person urinates.
- D. Because the hymen is very delicate and may be ruptured even when running or doing strenuous exercises.
Correct Answer: B
Rationale: The hymen can be perforated by various non-sexual activities, making it an unreliable indicator of virginity.
Which of the following suggestions should a nurse give breast-feeding mothers to prevent or eliminate mastitis and breast abscess?
- A. Offer the opposite breast at each feeding to their infants.
- B. Minimize frequent nursing of the infants.
- C. Avoid breast-feeding.
- D. Avoid bathing or showering regularly.
Correct Answer: A
Rationale: Alternating breasts during feedings helps prevent blockages and infections.