This article discuses negative feedback loops plus many other points that relate back to the main topic of homeostasis. This picture explains how a negative feedback can contribute to the body returning to homeostasis.
This article defines and explains a positive feedback. It discusses how a positive feedback will enhance a change. It also tells the relationship between positive and negative feedback loops. The picture depends the understanding of a positive feedback by providing a visual example.
This picture gives a visual description of stimulus and response. It gives two scenarios, one where the stimulus is the increase of blood glucose level and the response is the secretion of insulin. The other scenario is when the stimulus is low blood glucose levels and the response is the secretion of glucagon. This can help improve understanding of stimulus and response.
This article and picture explains the difference between physiological and behavioral responses. It also gives examples for both which provides assurance of understanding.