A 29-year-old man recently experienced what he describes as severe pounding palpitations. The attacks had lasted about 20 minutes each and had been accompanied by severe sweating, headache, and paleness and coldness of the skin. While in the hospital clinic he has another attack. His pulse rate is 120 beats per minute, and his blood pressure is $240 / 140 \mathrm{~mm} \mathrm{Hg}$. A preliminary diagnosis of pheochromocytoma is made, which is later confirmed by analysis of the uri-nary content of catecholamines. What hormones are
secreted by the cells of the suprarenal medulla, and
what is their action?

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The Answer of A 29-year-old man recently experienced what he describes as severe pounding palpitations. The attacks had lasted about 20 minutes each and had been accompanied by severe sweating, headache, and paleness and coldness of the skin. While in the hospital clinic he has another attack. His pulse rate is 120 beats per minute, and his blood pressure is $240 / 140 \mathrm{~mm} \mathrm{Hg}$. A preliminary diagnosis of pheochromocytoma is made, which is later confirmed by analysis of the uri-nary content of catecholamines. What hormones are
secreted by the cells of the suprarenal medulla, and
what is their action?

A 29-Year-Old Man Recently Experienced What He Describes as Severe 240/140 mmHg240 / 140 \mathrm{~mm} \mathrm{Hg}240/140 mmHg

A 29-Year-Old Man Recently Experienced What He Describes as Severe $240 / 140 \mathrm{~mm} \mathrm{Hg}$