题1:a [注解]:生长激素是由垂体分泌的肽类激素,其分泌受下丘脑产生的激素性物质的刺激或抑制性调节。对下丘脑的刺激称做多巴胺能性,如给与L—多巴使多巴胺增加时,血中生长激素则上升。此外,胰岛素负荷的低血糖、精氨酸负荷或β—阻断剂(心得安)也可使血中生长激素增加。胰高血糖素、心得安同时给与,对生长激素分泌是强力的刺激,这些均对垂体侏儒症有诊断价值。 Question 1: a [Note]: Growth hormone is secreted by the pituitary peptide hormone, the secretory hormone produced by the hypothalamus stimulated or inhibitory regulation. The stimulation of the hypothalamus is called dopaminergic, and as long as dopamine is added to L-dopa, the blood ghrelin is increased. In addition, insulin load hypoglycemia, arginine load or β-blocker (propranolol) also can increase blood growth hormone. Glucagon, propranolol given at the same time, is a powerful stimulus for growth hormone secretion, which are diagnostic value of pituitary dwarfism.