Secretion

The secretion from Tom's wound was a horrible green color.

Copper plays an important role in nerve conduction, bone growth and hormone secretion.

The many birds that choose Bolinas as their winter home would have a feast if these butterflies were edible, but Monarchs are protected by an acrid secretion which is distasteful to birds, and enjoy a long life on this account, living not only all winter, but long enough to taste the sweetness of the spring wildflowers.

The secretion of pituitary gland hormones is controlled by the hypothalamus.