Identify the glands that secrete these hormones: glucagon, PTH, and TSH.

Correct Answer: C

Rationale: The correct answer is C (Pancreas, parathyroid, anterior pituitary) because glucagon is secreted by the pancreas, PTH (parathyroid hormone) is secreted by the parathyroid glands, and TSH (thyroid-stimulating hormone) is secreted by the anterior pituitary gland. Choice A (Neurohypophysis, pancreas, ovary) is incorrect because the neurohypophysis secretes oxytocin and ADH, not glucagon, PTH, or TSH. The ovary does not secrete any of these hormones. Choice B (Adrenal cortex, pancreas, neurohypophysis) is incorrect because the adrenal cortex secretes cortisol and aldosterone, not glucagon, PTH, or TSH. The neurohypophysis secretes oxytocin and ADH, not the hormones in question. Choice D (Testes, thymus, adenohypophysis

Correct Answer: B

Rationale: The correct answer is B: nervous system. The endocrine system and nervous system work together in maintaining the body's equilibrium through communication and regulation of bodily functions. The nervous system controls rapid responses, while the endocrine system regulates slower, long-term responses through hormones. The digestive system (A) primarily focuses on breaking down food and absorbing nutrients. The respiratory system (C) is responsible for gas exchange. The reproductive system (D) is involved in reproduction and hormone production, but not in maintaining the body's equilibrium.

Correct Answer: B

Rationale: The correct answer is B: Steroid hormones are secreted by the adrenal cortex. The adrenal cortex is responsible for producing steroid hormones such as cortisol, aldosterone, and sex hormones. This is supported by the understanding of endocrine gland functions. Choices A, C, and D are incorrect because steroid hormones do not require a second messenger, are not secreted by the posterior pituitary, and are not secreted by the pancreas. Understanding the specific glands and their hormone production is crucial in selecting the correct answer.

Correct Answer: C

Rationale: The correct answer is C: Pancreas. The pancreas is both an endocrine and exocrine gland. It secretes digestive enzymes (exocrine function) into the small intestine to aid in digestion, and it also releases hormones like insulin and glucagon (endocrine function) into the bloodstream to regulate blood sugar levels. Rationale: 1. The thyroid gland (choice A) is solely an endocrine gland responsible for producing hormones that regulate metabolism. 2. The thymus gland (choice B) is primarily an endocrine gland involved in immune function, producing hormones that regulate T cell development. 3. The pituitary gland (choice D) is known as the master gland and is purely endocrine, controlling various hormonal functions in the body. In summary, the pancreas uniquely exhibits both endocrine and exocrine functions, making it the correct choice.

Correct Answer: D

Rationale: The correct answer is D: Pituitary gland. The pituitary gland is known as the master gland because it controls the functions of other endocrine glands in the body by secreting various hormones that regulate growth, reproduction, metabolism, and other essential bodily functions. It is located at the base of the brain and plays a crucial role in maintaining hormonal balance. Explanation for other choices: A: Adrenal gland primarily regulates stress response and metabolism. B: Liver is not an endocrine gland; it is involved in metabolism and detoxification. C: Pancreas is responsible for regulating blood sugar levels through insulin and glucagon secretion but is not known as the master gland.