Karl landsteiner placed animal blood in human blood and discovered that the blood clumped. which did his creativity lead to?
understanding the process of blood clotting
understanding the formation of blood cells
understanding the function of antibodies
understanding a, b, ab, and o blood groups

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.