A tumor of this organ common in children produces increased homovanillic acid and can be caused by amplification of N-myc, and these organs are enlarged in 21-hydroxylase deficiency. Overactive tumors in one section of this organ cause Conn's syndrome. One section of these organs contains three layers, called the zona reticularis, zona glomerulosa, and zona fasciculata. One section of these organs secretes a hormone that increases secretion of potassium and whose release is stimulated by angiotensin II. Another section 
A tumor of this organ common in children produces increased homovanillic acid and can be caused by amplification of N-myc, and these organs are enlarged in 21-hydroxylase deficiency. Overactive tumors in one section of this organ cause Conn's syndrome. One section of these organs contains three layers, called the zona reticularis, zona glomerulosa, and zona fasciculata. One section of these organs secretes a hormone that increases secretion of potassium and whose release is stimulated by angiotensin II. Another section of these organs secretes catecholamines like norepinephrine and epinephrine. For 10 points, name these paired glands that contain a cortex and a medulla and are located on top of the kidneys.
A tumor of this organ common in children produces increased homovanillic acid and can be caused by amplification of N-myc, and these organs are enlarged in 21-hydroxylase deficiency.
adrenal glands