Analyze Feedback and Stability Examples Practice Test

A person stands up quickly from lying down. For a moment, blood pressure in the upper body drops. Pressure sensors in blood vessels detect the drop and signal the heart to beat faster and blood vessels to constrict, raising blood pressure back toward normal within seconds. Which statement best analyzes how the loop prevents a runaway decrease in blood pressure?

A small cut damages a blood vessel. Platelets stick to the damaged area and release chemicals that attract more platelets. The newly arriving platelets release more chemicals, which attracts even more platelets. The process speeds up until a clot forms and seals the wound. Which sequence best describes the feedback loop and its outcome?