Hypersecretion of Thyroxin would be caused by an increase in the release of:
Correct answer: C. TSH or ACTH
- A. FSH or LH
- B. STHRH or STH
- C. TSH or ACTH
- D. TRH or TSH
Explanation
The release of thyrotrophin in releasing factors from the hypothalamus is controlled by the levels of thyroxine in the blood. In the presence of low levels of thyroxine, there is increasing production of TSH and vice versa (Fig 17.16). It is secreted throughout life but particularly reaches high levels during periods of rapid growth and development. It acts directly on the cells of the thyroid gland, increasing both their numbers and their secretory activity
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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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