And now steroid hormone is synthesized either in the smooth endoplastic reticulum or in the mitochondria of the cell. Now, steroid hormones are lipid soluble, and that means they cannot dissolve in the blood. And so they actually require carrier proteins to carry them to their target cell. So once inside the bloodstream, the steroid hormones need carrier proteins. Now, once these steroid hormones actually arrive at a target cell, they can easily transport themselves. They can easily move across the cell membrane, and that's because these are lipid soluble.