Ace the NCLEX Cardiovascular Challenge 2026 – Pump Up Your Success!

Perfusion is the flow of blood through the capillary networks of a tissue, enabling exchange at the cellular level. It describes delivering oxygen and nutrients to the tissue and carrying away carbon dioxide and wastes. The best description is the delivery of blood to a capillary bed, because it is through that capillary network that nutrients reach cells and wastes are removed. The other options describe related processes but not perfusion itself: removing waste from capillaries is part of exchange rather than the act of delivering blood to tissue; returning blood to the heart via veins is venous return; mixing of blood in the chambers relates to cardiac mixing, not tissue perfusion.