A. endo (inside) + crine (secretion) = to secrete internally (i.e., into the bloodstream)
B. endo (inside) + crine (hormone) = hormones within the body
C. endo (outside) + crine (secretion) = to secrete outside the body (i.e., through the breath)
D. endo (outside) + crine (hormone) = hormones outside the body