What percentage of thyroxine is released from the thyroid gland?
Correct answer: D. 90%
- A. 60%
- B. 40%
- C. None
- D. 90%
Explanation
The thyroid gland produces just 20% of the highly active triiodothyronine T3, but it produces 90% of the prohormone thyroxine T4.
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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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