« Back to Glossary Index

A humoral substance is a body fluid, or a substance related to a body fluid, especially with regard to immune responses involving antibodies in body fluids (as distinct from cells). Many of the bacteria that cause infectious diseases in humans multiply in the extracellular spaces of the body, and these extracellular spaces are protected by the humoral immune response, in which antibodies produced by B cells cause the destruction of extracellular microorganisms and prevent the spread of intracellular infections.

Get SomnusNooze, our e-newsletter

Sign up to receive HF updates, news from the world of sleep research, first-person stories, and more.

You will receive and email from (please check your junk/spam folder if needed) to confirm your subscription to our newsletter through MailChimp. You are not subscribed until you confirm. Thank you for your interest in Hypersomnia Foundation!