While the Cardiovascular System Can Be Breached by Microorganisms,mechanisms Are

While the cardiovascular system can be breached by microorganisms,mechanisms are in place to prevent infection.  These include ________.

A) a close association with the lymphatic system which screens and filters the blood
B) blood vessels that are impermeable to microorganisms
C) toxic chemicals that will kill any microbes that enter the bloodstream
D) a connective tissue fibrous mesh that filters the blood within the vessels,preventing pathogens from circulating