Chapter 19: The Cardiovascular System: Blood Vessels

b. medulla - modified sympathetic ganglion; chromaffin cells secrete epinephrine and norepinephrine. 3. hormones and their functions. a. aldosterone. secreted in response to low blood sodium level, high blood potassium level, low blood pressure, or low blood volume. acts on kidneys to conserve sodium and excrete potassium ................
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