Nokea
Ovulation occurs in response to the release of an anterior pituitary hormone known as ________ hormone
- A. antidiuretic
- B. thyroid-stimulating
- C. luteinizing
- D. follicle-stimulating
Correct Answer: C
Rationale: The correct answer is C: luteinizing hormone (LH). LH is released by the anterior pituitary gland to trigger ovulation in females. It causes the mature ovarian follicle to release an egg during the menstrual cycle. Antidiuretic hormone (A) is involved in regulating water balance, not ovulation. Thyroid-stimulating hormone (B) stimulates the thyroid gland, not the ovaries. Follicle-stimulating hormone (D) helps in the development of ovarian follicles, but it is not responsible for triggering ovulation. Therefore, C is the correct answer as it directly stimulates the release of the egg during ovulation.
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Which of the following is/are an example(s) of asexual reproduction?
- A. Fission.
- B. Fragmentation.
- C. Budding.
- D. All of the abov
Correct Answer: D
Rationale: The correct answer is D: All of the above. Asexual reproduction involves the production of offspring from a single parent without the involvement of gametes or fertilization.
- Fission: Organism splits into two or more parts, each regenerating into a new individual.
- Fragmentation: Parent organism breaks into fragments, with each fragment developing into a new individual.
- Budding: New individuals develop as outgrowths or buds from the parent organism.
All these processes result in genetically identical offspring, making them examples of asexual reproduction.
Which statement describes a function of the human male reproductive system?
- A. It produces gametes in testes.
- B. It supplies a fluid that protects the fetus.
- C. It provides support for the development of the embryo.
- D. It provides nutrient materials through a placenta.
Correct Answer: A
Rationale: The correct answer is A because the primary function of the human male reproductive system is to produce gametes (sperm) in the testes. Sperm are essential for fertilization and reproduction. Choice B is incorrect as the fluid that protects the fetus is produced by the female reproductive system. Choice C is incorrect as embryo development support is provided by the female reproductive system. Choice D is incorrect as the placenta, which provides nutrient materials, is a structure formed by the female reproductive system during pregnancy.
Infertility could develop when the sperm cells display _____.
- A. a count of 120 million per ml semen
- B. increased acrosomal activity
- C. normal morphology
- D. a count of less than 20 million per ml semen
Correct Answer: D
Rationale: The correct answer is D because a low sperm count (less than 20 million per ml semen) can lead to infertility as it decreases the chances of successful fertilization. A high sperm count (choice A) is actually beneficial for fertility. Increased acrosomal activity (choice B) can enhance fertilization potential. Normal morphology (choice C) refers to the shape and size of sperm, which is important for fertility but not the primary factor in infertility due to low sperm count. Overall, a low sperm count is the most significant factor in infertility.
A man suffers from a disease that destroyed only the motor neurons of the spinal cord below the thoracic region. Which aspect of sexual function would not be possible?
- A. Arousal
- B. Erection
- C. Lubrication
- D. Ejaculation
Correct Answer: D
Rationale: The correct answer is D: Ejaculation. Motor neurons control muscle movements, including those involved in ejaculation. Since the motor neurons below the thoracic region are damaged, the man would not be able to ejaculate. Arousal (A), erection (B), and lubrication (C) are controlled by different mechanisms and do not solely rely on motor neurons in the spinal cord.
The tiny female sex cell that unites with male sperm to form a zygote or fertilized egg.
- A. Ovary
- B. Ovum
- C. Gonad
- D. Gamets
Correct Answer: B
Rationale: The correct answer is B: Ovum. The ovum is the mature female sex cell that unites with a male sperm during fertilization to form a zygote. Ovary (A) is the organ that produces eggs but is not the actual female sex cell. Gonad (C) is a general term for reproductive organs, not the specific female sex cell. Gametes (D) refer to both male and female sex cells, so it is a broad term and not the specific female sex cell. The ovum is the only choice that accurately represents the tiny female sex cell involved in fertilization.