Insulin is secreted by islets of Langerhans of pancreas and serves to lower the blood glucose level by stimulating the uptake of glucose by cells, specifically muscle cells, liver cells and adipose tissues cells. This makes option A incorrect. The emergency conditions activate the sympathetic motor nerve and make the adrenal medulla to release epinephrine (adrenaline) and nor-epinephrine which in turn prepare the body for flight or fight response by increasing the heart beat rate and blood pressure. This makes option B correct. Progesterone is female reproductive hormone that serves in endometrial re growth and inhibition of FSH and LH release. Option C is incorrect. Thyroxine is a thyroid hormone which targets all tissues and stimulates metabolic rate, growth and development. This makes option D incorrect. Correct answer is B.