Acromegaly is caused by:
Correct answer: A. Excess STH
- A. Excess STH
- B. Excess thyroxine
- C. Thyroxine deficiency
- D. Excess adrenaline
Explanation
Acromegaly is caused by an excess of STH (somatotrophic hormone), which is released by the anterior lobe of the pituitary after adolescence. The bones of the lower jaw and limbs become abnormally enlarged but the body does not attain a giant stature. Excess of thyroxine causes cretinism and myxoedema. Excess of adrenaline causes increased BMR, heartbeat, excitement etc.
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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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