The properties of endocrine system include the following except

Step 1: Analyze the question We are asked which option is NOT a property of the endocrine system. This is an "except" question, so three options are true of endocrine glands and one is false.

Step 2: Key concept The endocrine system is made up of ductless glands, such as the pituitary, thyroid, adrenal glands and the islets of Langerhans in the pancreas. They release hormones directly into the bloodstream, not through ducts. Glands that release their secretions through ducts are exocrine glands, such as the salivary glands, sweat glands and the digestive-enzyme part of the pancreas.

Step 3: Check each option

• A. Secretion of hormones: This is the main function of endocrine glands, so it is a property.
• B. Transportation by blood to the target organ: Hormones travel in the blood to their target organs, so it is a property.
• C. Having specific effect: Each hormone acts on specific target cells or organs, so it is a property.
• D. Release of secretion into ducts: This describes exocrine glands. Endocrine glands are ductless, so it is not a property of the endocrine system.

Step 4: Answer

Exam tip: Remember "Endo = Enter blood, Exo = Exit through ducts." Whenever you see "ducts" in a question about endocrine glands, think exocrine. Also, "ductless" is the word WASSCE often uses to describe endocrine glands.