Nokea
Which hormones regulate testicular activity?
- A. FSH
- B. LH
- C. GH
- D. Both FSH and LH
Correct Answer: D
Rationale: Testicular activity is regulated by both follicle-stimulating hormone (FSH) and luteinizing hormone (LH). FSH stimulates sperm cell production in the testes, while LH stimulates testosterone production by Leydig cells in the testes. Therefore, both FSH and LH are essential in controlling testicular activity.
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Which of the following are functions of the skeletal system? (Select one that does not apply.)
- A. Support the body
- B. Hemopoiesis
- C. Conduct impulses
- D. Provide protection
Correct Answer: C
Rationale: The correct answer is C, 'Conduct impulses.' The skeletal system's primary functions include supporting the body, hemopoiesis (blood cell production), and providing protection to internal organs. Conducting impulses is a function of the nervous system, not the skeletal system. The skeletal system serves as the framework for the body, enabling movement, protecting vital organs, producing blood cells, storing minerals, and supporting the overall structure of the body.
Which of the following are functions of the skeletal system? (Select the ONE that does not apply.)
- A. Supporting the body
- B. Hemopoiesis
- C. Conducting impulses
- D. Providing protection
Correct Answer: C
Rationale: The correct answer is C, 'Conducting impulses.' The skeletal system's primary functions include supporting the body to maintain posture and provide structure, facilitating movement, protecting internal organs, and producing blood cells through hemopoiesis. Conducting impulses is a function of the nervous system, not the skeletal system.
Where does digestion begin in the digestive system?
- A. Esophagus.
- B. Small intestine.
- C. Stomach.
- D. Oral cavity.
Correct Answer: D
Rationale:
Which structure controls the hormones secreted by the pituitary gland?
- A. hypothalamus
- B. adrenal gland
- C. testes
- D. pancreas
Correct Answer: A
Rationale: The correct answer is the hypothalamus. The hypothalamus is a region of the brain located below the thalamus that plays a crucial role in controlling the pituitary gland. It releases hormones that either stimulate or inhibit hormone production in the pituitary gland, thus regulating various bodily functions. The adrenal gland, testes, and pancreas do not directly control the hormones secreted by the pituitary gland.
Which heart chamber has the thickest wall?
- A. Right atrium
- B. Left atrium
- C. Right ventricle
- D. Left ventricle
Correct Answer: D
Rationale: The left ventricle has the thickest wall of all the heart chambers because it needs to pump oxygenated blood to the entire body. Its muscular wall is thicker and more powerful compared to the other heart chambers. The right atrium receives deoxygenated blood from the body, the left atrium receives oxygenated blood from the lungs, the right ventricle pumps deoxygenated blood to the lungs, while the left ventricle pumps oxygenated blood to the body. Due to the higher workload and pressure required to push blood to the entire body, the left ventricle is the most muscular and has the thickest wall.