Excessive production of thyroid hormones by the thyroid gland:
Correct answer: B. Can cause nervousness, irregular heartbeat, and weight loss
- A. Is called hypothyroidism
- B. Can cause nervousness, irregular heartbeat, and weight loss
- C. Can cause stunted growth and retardation in children
- D. Can cause a goiter
Explanation
Excess thyroxine produces a condition called Graves' disease, with exophthalmic goiter and increase in the basal metabolic rate. This can lead to cardiac failure if prolonged. The cause of Graves' disease is the production of an abnormal body protein which continuously stimulates the thyroid to excessive secretion.
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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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