Horseshoe Crabs Saved My Life

Horseshoe crabs, ancient arthropods, have unique blue blood due to hemocyanin. Their blood contains coagulogen, which forms a barrier against bacteria, making it invaluable for medical testing. The LAL test, derived from their blood, ensures injectable drugs are bacteria-free. Conservation efforts are underway to protect these creatures while exploring synthetic alternatives.

Describe the internal defense mechanism that horseshoe crabs use against bacteria.

What is the significance of horseshoe crab blood in human medical treatment?