Which one of the following endocrine glands stores its secretion in the extracellular space before discharging it into the blood?
Correct answer: B. Thyroid
- A. Testes
- B. Thyroid
- C. Pancreas
- D. Adrenal
Explanation
The thyroid gland secretes three hormones: thyroxine or tetraiodothyronine (T 4 ), triiodothyronine (T 3 ) and calcitonin. Thyroxine and Triiodothyronine are iodinated forms of the amino acid tyrosine. They are stored in the colloid that fills the follicles, and are released to the blood when needed. The storage occurs in an unusual place, the extracellular colloid.
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About Coordination and Control
Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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