Testosterone is best described as:

Correct Answer: A

Rationale: Testosterone is best described as virilizing because it is the primary male sex hormone responsible for the development of male characteristics such as facial hair, deep voice, and muscle mass. It plays a key role in virilization. The other choices, lactogenic, adenohypophyseal, and pancreatic, are incorrect because testosterone is not primarily associated with lactation, the anterior pituitary gland, or the pancreas.

Correct Answer: C

Rationale: Excess secretion of epinephrine activates the fight-or-flight response, leading to the release of stored glucose into the bloodstream, elevating blood glucose levels. This helps provide immediate energy for the body to respond to stress. Epinephrine does not relieve anxiety (Choice A), as it is a stress hormone. It does not stimulate glycogen synthesis (Choice B) but rather breaks down glycogen to release glucose. Epinephrine increases heart rate and blood pressure (opposite of Choice D) to support increased energy needs during stress. Thus, the correct answer is C.

Correct Answer: A

Rationale: The correct answer is A: Lowers blood glucose levels. Insulin is a hormone produced by the pancreas that helps regulate blood glucose levels by promoting the uptake of glucose into cells for energy storage. This process reduces the concentration of glucose in the bloodstream. Choices B, C, and D are incorrect because insulin does not stimulate cells to make glucose (B), deficiency does not cause diabetes insipidus (C), and it does not directly affect blood volume (D).

Correct Answer: A

Rationale: The correct answer is A: excess facial hair. Virilization refers to the development of male secondary sexual characteristics in females due to increased androgen levels. Excess facial hair, known as hirsutism, is a classic sign of virilization. Buffalo hump (B) and truncal obesity (C) are associated with Cushing's syndrome, not virilization. Gonadal atrophy (D) refers to the shrinkage of the gonads and is not a typical feature of virilization.

Correct Answer: B

Rationale: Thyroxine is also known as T4, a thyroid hormone produced by the thyroid gland. It plays a crucial role in regulating metabolism. TSH (Thyroid Stimulating Hormone) is a hormone produced by the pituitary gland to stimulate thyroid hormone production, not thyroxine itself. Choice C is incorrect because thyroxine exerts negative feedback on TSH, not T3. Choice D is incorrect as thyroxine actually increases basal metabolic rate. Thus, the correct answer is B as thyroxine is indeed T4.