Question

multiple choice question
platelet repulsion, dilution, and substances such as heparin or antithrombin help do what?

prevent hdn

increase the spread of infection

enhance gas diffusion in capillary networks

prevent inappropriate clotting

Explanation:

Heparin and antithrombin are anticoagulants, and platelet repulsion/dilution also act to stop unwanted blood clotting. HDN (hemolytic disease of the newborn) is unrelated, increasing infection or enhancing gas diffusion don't match these mechanisms. So the correct option is about preventing inappropriate clotting.

Answer:

D. Prevent inappropriate clotting (assuming the last option is labeled D; if labels are different, adjust identifier but the text is "Prevent inappropriate clotting")