Nokea
Acrosome is filled with _________.
- A. Lipids
- B. Hormones
- C. Digestive enzymes
- D. None of the above
Correct Answer: C
Rationale: The correct answer is C: Digestive enzymes. The acrosome is a specialized organelle found in the head of sperm cells and is filled with enzymes that are crucial for fertilization. These enzymes help the sperm penetrate the outer layers of the egg during fertilization. Choice A (Lipids) is incorrect because the acrosome primarily contains enzymes, not lipids. Choice B (Hormones) is incorrect as hormones are not stored in the acrosome. Choice D (None of the above) is incorrect as the acrosome does indeed contain digestive enzymes essential for the sperm's fertilization process.
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Elbow, knee are _____ type of joints
- A. Ball-an
- B. socket
- C. Hinge
- D. Pivot
Correct Answer: C
Rationale: The correct answer is C: Hinge. Elbow and knee joints are classified as hinge joints because they primarily allow movement in one plane, similar to a door hinge. These joints enable flexion and extension movements, which are characteristic of hinge joints. The other choices (A: Ball-and-socket, B: Socket, D: Pivot) do not accurately describe the structure and function of the elbow and knee joints. Ball-and-socket joints allow for a wider range of motion in multiple directions, sockets are components of ball-and-socket joints, and pivot joints allow rotational movement around a central axis, none of which align with the movement pattern of the elbow and knee joints. Therefore, the correct classification for elbow and knee joints is hinge joints due to their specific range of motion.
Which structure will actually become the fetus?
- A. morula
- B. blastocyst
- C. inner cell mass
- D. zygote
Correct Answer: C
Rationale: The correct answer is C: inner cell mass. After fertilization, the zygote undergoes several cell divisions to form a hollow ball of cells called a blastocyst. Within the blastocyst, the inner cell mass contains cells that will develop into the fetus. The morula is an earlier stage consisting of a solid ball of cells. The zygote is the initial cell formed from the fusion of egg and sperm, but it does not directly become the fetus. Therefore, the inner cell mass is the structure that will actually develop into the fetus, making it the correct answer.
Parturition is another term for
- A. secretory phase ________.
- B. placental stage
- C. menopause
- D. postpartum stage
Correct Answer: D
Rationale: Parturition refers to the process of giving birth. The postpartum stage immediately follows childbirth, involving recovery and adjustment to motherhood. The secretory phase is a phase of the menstrual cycle involving hormonal changes, not related to childbirth. The placental stage refers to the stage after the baby is born when the placenta is delivered. Menopause is the natural cessation of menstruation and fertility in women, occurring later in life and not related to childbirth. Therefore, the correct answer is D because it directly relates to the process of giving birth.
The evolutionary stages of the ovarian follicles are:
- A. secondary;
- B. tertiary (de Graaf);
- C. primordial;
- D. evolutionary;
Correct Answer: C
Rationale: The correct answer is C: primordial. Ovarian follicles go through several stages of development. Primordial follicles are the earliest stage, containing primary oocytes surrounded by a single layer of squamous cells. This stage represents the resting pool of follicles. Secondary follicles come next, with primary oocytes surrounded by multiple layers of granulosa cells. Tertiary (de Graaf) follicles are the most advanced stage, containing a fluid-filled antrum and a mature oocyte. Evolutionary is not a recognized stage in ovarian follicle development. Secondary is incorrect as it comes after primordial, and tertiary is incorrect as it is not the earliest stage.
In what specific part of the male reproductive system do maturing sperm gain increased motility and their ability to swim?
- A. Seminiferous tubules
- B. Epididymis
- C. Ductus deferens
- D. Ejaculatory duct
Correct Answer: B
Rationale: The correct answer is B: Epididymis. The epididymis is where maturing sperm gain increased motility and their ability to swim due to the presence of specific proteins and enzymes that facilitate this process. Sperm leave the seminiferous tubules in an immature state and undergo maturation in the epididymis through interactions with these proteins. The ductus deferens and ejaculatory duct are not involved in the maturation process of sperm and do not contribute to their motility. The seminiferous tubules are responsible for sperm production but not for the maturation of sperm motility.