Which of the following occur due to increased secretion of testosterone during puberty in male humans?

Correct Answer: A

Rationale: Step 1: Increased muscle growth (1) is due to testosterone promoting protein synthesis, leading to muscle hypertrophy. Step 2: Deepening of voice (2) is caused by testosterone thickening the vocal cords. Step 3: Growth of facial hair (3) is stimulated by testosterone promoting hair follicle growth. Step 4: Enlargement of testes (4) is a direct effect of increased testosterone levels. Therefore, choices A, B, C, and D are analyzed: - B is incorrect as it excludes the enlargement of testes. - C is incorrect as it excludes the growth of facial hair. - D is incorrect as it excludes both muscle growth and the growth of facial hair. Conclusion: Choice A is correct as it includes all the effects of increased testosterone secretion during puberty in male humans.

Correct Answer: C

Rationale: The correct answer is C: -1, 0. Electrons have a charge of -1, while neutrons have no charge (0). This is because electrons are negatively charged particles, while neutrons are neutral. The other choices are incorrect because A: 0, 0 doesn't differentiate between the charges of electrons and neutrons, B: 0, -1 incorrectly assigns a charge to neutrons, and D: -1, +1 incorrectly assigns a charge to neutrons and doesn't represent the relative charges accurately.

Correct Answer: C

Rationale: The correct answer is C: ADH. The pituitary gland consists of two parts: the anterior and posterior pituitary. ADH, also known as vasopressin, is synthesized in the hypothalamus and stored in the posterior pituitary. Therefore, it is not synthesized in the pituitary gland itself. LH, FSH, and TSH are all hormones synthesized and released by the anterior pituitary gland.

Correct Answer: A

Rationale: Insulin enhances glucose transport by promoting the translocation of glucose transporter proteins to the cell membrane. The brain does not require insulin for glucose uptake as it has a specialized transporter. Skeletal muscle, myocardium, and adipose tissue all rely on insulin for increased glucose transport. Therefore, the correct answer is A. The other choices (B, C, and D) are incorrect as they all depend on insulin to enhance glucose transport in their respective tissues.

Correct Answer: C

Rationale: The correct answer is C: Its isthmus is at the level of thyroid cartilage. The isthmus of the thyroid gland is located at the level of the cricoid cartilage, not the thyroid cartilage. The thyroid gland is closely related to the inferior (recurrent) laryngeal nerve (A), it moves on swallowing (B), and it is invested by pretracheal fascia together with the parathyroids (D). These choices are correct anatomical characteristics of the thyroid gland.