Lacrimal secretions contain a type of antibody that blocks the passage of antigens to deeper internal tissues. Which type of antibody is this, and where can this antibody be found in the body?

The lacrimal glands secrete tears which act to lubricate and protect the cornea and eyeball from injury which may result from small particles such as dust. Tears are a watery fluid with an electrolyte content similar to that of plasma and contains: bactericidal enzymes known as lysozyme and lactoferrin.