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Heart Anatomy › ViewValve that blood is forced through from right ventricle into pulmonary arteries.
A. pulmonary valve
B. aortic valve
C. mitral valve
Defence against Infectious Diseases › View
a long-lived cell of the immune system that has previously encountered a specific antigen and that upon re-exposure produces large amounts of antibody.
A. Memory cell
B. Metabolism
C. Mucous membranes