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Which of the following endocrine gland stores its secretion in the extracellular space before discharging it into the blood?

1. Pancreas
2. Adrenal
3. Testis
4. Thyroid

Correct answer: Thyroid

Solution

The thyroid is unique because it stores its hormone precursor in the follicular lumen as colloid, an extracellular space, before reabsorbing and releasing it into the blood. The other listed endocrine glands generally store hormones inside cells or release them directly after synthesis.

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