Conventional 'free diffusion' model of steroid hormone release should be revisited

Steroid hormones - hormones such as testosterone and estradiol - control various aspects of animal biology and are crucial for the proper functioning of the body. Produced and secreted by endocrine glands in the body, these cholesterol derivatives are released into the blood through which they are transported to cells of various organs where they mediate a wide variety of important physiological functions.