Glands and Hormones: Types and Functions — NEET Biology

Which of the following statements about hormone-producing structures are correct? S1. Pituitary, thyroid, adrenal, pancreas, and gonads are examples of organised endocrine glands. S2. The gastrointestinal tract contains diffuse hormone-producing cells, distinct from classical endocrine glands. S3. Organs like the heart and kidney are not typically considered part of the endocrine system despite producing hormones. S4. A composite gland like the pancreas functions solely as an endocrine gland, secreting hormones. S5. The modern definition of hormones expands the scope beyond chemicals produced only by organised endocrine glands.