BIOSC 1250 Lecture Notes - Lecture 23: Adrenal Medulla, Bile Acid, Blood Sugar
Document Summary
Insulin has a dominant role in the homeostasis of glucose. This can be highlighted by looking at the impact of inadequate insulin action, which is the condition of diabetes mellitus. While insulin is the main hormone involved in switching between absorptive and post-absorptive state metabolic processes, glucagon does contribute to helping mobilize glucose when glucose levels are low. For example, during exercise, plasma glucose levels fall significantly and glucagon levels rise to help mobilize more glucose. Other hormones also play a role in homeostasis, which are secreted from the adrenal cortex. The adrenal cortex secretes aldosterone and cortisol (the glucocortiod ) which promotes energy mobilization. It is involved in glucose homeostasis by promoting the mobilization of glucose storages. Stress activates the hypothalamus to secrete crh to the anterior pituitary which secretes acth to the adrenal cortex. On the other hand, the adrenal medulla releases epinephrine (sympathetic).
