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TEKS 10A: Describe the interactions that occur among systems that perform the functions of regulation, nutrient
absorption, reproduction, and defense from injury or illness in animals.
• B cells discover antigens in body fluids.
• T cells are released by infected body cells or immune cells that
have encountered antigens.
• Vaccination stimulates the immune system with an antigen. The
immune system produces memory B cells and memory T cells
that quicken and strengthen the body’s response to repeated