Mr. jacobson, a tax accountant, comes to the clinic complaining of feeling very "stressed out" and anxious. he admits to drinking 10 to 12 cups of coffee daily. his doctor (knowing that caffeine alters the threshold of neurons) suggests he reduce his intake of coffee. what is caffeine's effect on the threshold of neurons, and how might this affect explain mr. jacobson's symptoms?

Hormones are chemical molecules produced by endocrine glands. one such endocrine gland is the thyroid gland, which synthesizes the thyroid hormone, which in turn affects the heart muscles. which two statements describe the probable reason for the function of the hormone? the cells in the heart have specific receptors that allow for the intake of hormones. the heart and the endocrine glands have the exact same types of cells. all cells make the same types of hormones. thyroid hormones show their effect on the heart by means of specialized cells. thyroid cells and cardiac cells have different dna.