This worksheet takes the student through the feedback loop process and can be done as a make-up assignment, assessment, stand-alone or homework assignment. The NGSS standards require a thorough knowledge of homeostasis in the human body, and thus I developed this simple, understandable worksheet with some opportunities for critical thinking! Answer key is included. If you want more detailed answers, students can be given the opportunity to look it up on-line. for example, when the pancreas is mentioned as the receptor in the blood sugar example, students can look it up and find that the Beta cells have receptors on them that receive glucose and thereby know to release insulin.