Which of the following hormones is wrongly paired with its secretory organ?

Analyze the question: We need the pair in which the hormone does not match the organ that secretes it.

Concept: Each hormone is made by a specific endocrine gland or organ.

Checking each option:

• A. Oestrogen and ovary: Correct. The ovary (Graafian follicle) secretes oestrogen.
• B. Oxytocin and hypothalamus: Correct. Oxytocin is made in the hypothalamus and stored and released by the posterior pituitary. Many textbooks therefore accept the hypothalamus as its source.
• C. Adrenalin and kidney: Wrong. Adrenalin (adrenaline or epinephrine) is secreted by the adrenal medulla, part of the adrenal glands. These sit on top of the kidneys but are not the kidneys themselves. The kidney secretes other hormones, such as erythropoietin and renin.
• D. Insulin and pancreas: Correct. The beta cells of the islets of Langerhans in the pancreas secrete insulin.

Answer: The wrongly paired option is C, adrenalin and kidney.

Tip: The adrenal glands are "ad-renal", meaning "next to the kidney". Being next to the kidney does not make them part of it. Remember adrenalin as the "fight or flight" hormone from the adrenal gland, not the kidney.