Gland Endocrine glands secrete substances that circulate through the blood stream. The glands secrete their products through basal lamina into the blood stream. Basil lamina typically can be seen a layer around the glands to which a million maybe more tiny blood vessels are attached. These glands often secrete hormones which play an important role in maintaining homeostasis. The pineal gland, thymus gland, pituitary gland, thyroid gland, and the two adrenal glands are all endocrine glands. Exocrine glands secrete their products through a duct onto an outer surface of the body, such as the skin or the gastrointestinal tract. Secretion is
The Sexual Brain performance, control of body temperature, stress, emotional responses, growth, and many other functions". LeVay notes that his INAH 3 study was his only publication on sex to that date, and that most of his previous research had been on the visual areas of the cerebral cortex. LeVay compares homosexuality to the disease sickle cell anemia, arguing that it may have persisted through a similar genetic mechanism. "The Sexual Brain" was first published in 1993 by MIT Press. "The Sexual Brain" received positive reviews from the journalist Peter Gorner in the "Chicago Tribune", Kenneth McLeish in "The Independent", the psychiatrist Avodah