Multiple choice Which of the following is a heterocrine gland? Parathyroid Salivary gland Pancreas Sebaceous glands Reveal answer Fill a bubble to check yourself C Correct answer Explanation Pancreas is an endocrine gland. Islets of Langerhans in the pancreas are endocrine in nature and secrete the hormones insulin and glucagon. The exocrine part secretes digestive enzymes.