GH mobilizes fats, stimulates protein synthesis, and inhibits glucose uptake and metabolism. Hypomagnesemia stimulates and hypermagnesemia inhibits this absorption. Tissue damage stimulates fibrocytes and induces the production of fibroblasts. Histamine also stimulates H+ secretion from parietal cells. It also stimulates glucagon secretion and fat accumulation. TSH stimulates the thyroid to secrete thyroid hormone. It indirectly stimulates both nicotinic and muscarinic acetylcholine receptors. Ghrelin stimulates hunger by triggering receptors in the hypothalamus. This stimulates actin branching and increases cell motility. Prolactin also stimulates proliferation of oligodendrocyte precursor cells. Moreover, this cytokine stimulates and modulate immune system. This accelerator effect stimulates demand further and encourages rising employment. ACTH also stimulates lipoprotein uptake into cortical cells. Bisacodyl stimulates enteric nerves to cause colonic contractions. This stimulates the LH receptor, thereby promoting testosterone synthesis.