The two types of feedback mechanisms involved in homeostasis are positive and negative feedback. Negative feedback mechanisms work to counteract changes from a set point, helping the body return to its optimal state. For example, when blood glucose levels rise, insulin is released to lower them. In contrast, positive feedback amplifies a response towards a goal, such as during childbirth when oxytocin increases contractions. Both mechanisms are essential for maintaining internal stability in living organisms, allowing them to respond appropriately to various internal and external stimuli.