Sympathetic nerve stimuli are responsible for the release of __________.

Ghrelin is a hormone produced in the stomach with target cells in the anterior pituitary. Its release is associated with feelings of hunger, and its release is lowest immediately after eating. Considering this, why do you think the stomach is not usually considered as an organ of the endocrine system?

Which statement below correctly identifies the difference between the endocrine system and other body systems?

Insulin operates by activating a receptor on the outside of the target cell. Based on your knowledge of hormone types, do you expect insulin to be an amino acid-based hormone or a steroid hormone, and why?

Why do steroid hormones use a transport protein?