The following are ductless glands except

Step 1: Analyze the question We are asked to find the option that is NOT a ductless gland.

Step 2: Explain the concept Glands are grouped by how they release their secretions:

• Endocrine (ductless) glands release hormones directly into the bloodstream. Examples: pituitary, thyroid, parathyroid, adrenal, gonads (ovaries and testes), and the islets of Langerhans in the pancreas.
• Exocrine glands release their secretions through ducts to a specific site. Examples: salivary glands, sweat glands, mammary glands, and the digestive-enzyme-producing part of the pancreas.

Step 3: Check each option

• A. Adrenal: Ductless. It secretes adrenaline and cortisol directly into the blood.
• B. Pancreatic: The pancreas is a mixed gland. Its islets of Langerhans secrete insulin and glucagon directly into the blood (endocrine), so it is generally accepted as a ductless gland in this context. It also has an exocrine part, which releases pancreatic juice through the pancreatic duct.
• C. Parathyroid: Ductless. It secretes parathormone, which regulates calcium.
• D. Salivary: Has ducts. Saliva flows through salivary ducts into the mouth, so it is an exocrine gland.

Step 4: Answer The salivary gland is the only option that is purely a duct-bearing (exocrine) gland, so it is the exception.

Tip: Remember that the pancreas is the "double agent", both endocrine and exocrine. When a question asks for the gland that is clearly NOT ductless, pick the one that is purely exocrine, such as salivary, sweat, or mammary glands. A quick memory aid: "Saliva, Sweat, and Milk travel through tubes."