This Circulatory System Quiz is designed to assess student mastery of blood components, circulatory structures, and system interactions in alignment with the South Carolina College- and Career-Ready Science Standards (2021), the 2025–2026 Assessment Specifications, and the Performance Level Descriptors (PLDs) for SC READY Science. The quiz uses a variety of question types to measure student understanding at multiple levels of rigor: Matching: Heart, blood vessels, red blood cells, white b