highly purified preparation of botulinum toxin A

tiny, closed-ended tubes that
extend into interstitial spaces, paralleling the blood
capillaries

mucosa-associated lymphoid tissue

A disease-causing agent

Destroys old red blood cells

thinner than those of veins

Natural killer

Guard against many types of pathogens; respond quickly

clear watery fluid that surrounds body cells
and flows in a system of lymph vessels throughout
the body

drain lymph from the lymphatic vessels

antigen-presenting cell

Respond against only a specific type of pathogen; respond more
slowly

Provides immunity in fetal life and in early years of growth

the larger of the collecting ducts, drains the rest (majority) of the body

major histocompatibility complex

A species is resistant to diseases that affect other species

the body’s ability to resist foreign organisms and toxins that damage tissues and organs; can be natural or adaptive

drives the entry of fluid into lymphatic capillaries

Immunoglobulin G

prevent the entry of certain pathogens
by providing a physical separation of pathogens and internal
tissues