Nokea
With respect to Sertoli cells which of the following statements is incorrect
- A. Nourish developing sperm
- B. receive stimulation by testosterone
- C. phagocytose defective sperm
- D. secrete the hormone inhibin which inhibits luteinizing hormone secretion
Correct Answer: D
Rationale: The correct answer is D because Sertoli cells do secrete inhibin, but it does not inhibit luteinizing hormone secretion. Inhibin actually inhibits follicle-stimulating hormone (FSH) secretion. Sertoli cells support spermatogenesis by nourishing developing sperm (A), they are stimulated by testosterone (B), and they also phagocytose defective sperm (C). Therefore, option D is incorrect as it misrepresents the role of inhibin in the endocrine regulation of the male reproductive system.
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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.
Large process on the femur that is present for attachment of muscles is
- A. condyle
- B. tubercle
- C. bone head
- D. trochanter
Correct Answer: B
Rationale: The correct answer is B: tubercle. A tubercle is a small rounded projection on a bone where muscles and ligaments can attach. In this case, the large process on the femur that serves as an attachment site for muscles is a tubercle.
Condyle (choice A) is a rounded prominence at the end of a bone, typically for articulation with another bone. Bone head (choice C) refers to the rounded end of a bone, usually forming a joint. Trochanter (choice D) is a large, blunt process on the femur that serves as an attachment point for muscles, but it is not the specific term for the large process on the femur mentioned in the question.
Sexual feelings are normal and necessary
- A. for reproduction to occur
- B. for the heart and lungs to function properly
- C. for an ovum to be released from a female’s ovary each month
- D. for teens to become adults
Correct Answer: A
Rationale: The correct answer is A because sexual feelings are indeed necessary for reproduction to occur. Sexual arousal and desire play a vital role in initiating the process of conception and ensuring the continuation of the human species. Without sexual feelings, procreation would not be possible.
Explanation for why the other choices are incorrect:
B: Sexual feelings are not necessary for the heart and lungs to function properly. These bodily functions are regulated by the autonomic nervous system, not by sexual arousal.
C: While sexual feelings can influence the release of an ovum during ovulation, they are not the sole factor. Ovulation can occur without sexual arousal.
D: Sexual feelings are not a requirement for teenagers to become adults. Puberty and the physical and emotional changes that come with it mark the transition from adolescence to adulthood, not sexual feelings.
Within minutes following a normal delivery, flow through the foramen ovale decreases dramatically. What is the cause of this change?
- A. Increased formation of prostaglandin E2 in the endocardium
- B. Increased rate of flow through the pulmonary artery
- C. Increased left atrial pressure
- D. Increased right atrial pressure
Correct Answer: C
Rationale: Step-by-step rationale for the correct answer (C):
1. After delivery, the baby takes its first breath, increasing oxygen levels.
2. This leads to the closure of the foramen ovale to shift blood flow from the right to the left side.
3. Increased left atrial pressure occurs due to increased blood returning from the lungs.
4. This pressure change causes the foramen ovale to close.
Summary of incorrect choices:
A: Increased prostaglandin E2 does not directly affect flow through the foramen ovale.
B: Increased flow through the pulmonary artery is expected after birth, but it does not directly impact the foramen ovale.
D: Increased right atrial pressure would not cause a decrease in flow through the foramen ovale.
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.