The bladder is the organ in the body used to store urine. When cells divide uncontrollably in the bladder, a tumour develops. This can lead to bladder cancer. The BCG vaccine has been used to treat bladder cancer. The BCG vaccine is introduced into the bladder. The tumour cells take up the weakened pathogens in the vaccine and act as antigen-presenting cells. (i) Name the process used by the tumour cells to take up the weakened pathogens. ................................................................................................................................. (ii) Suggest how antigen presentation by tumour cells stimulates an immune response that leads to the destruction of the tumour cells. ....................................................................................................................................... . ....................................................................................................................................... . ....................................................................................................................................... . ....................................................................................................................................... . ....................................................................................................................................... . ....................................................................................................................................... . ....................................................................................................................................... . .................................................................................................................................

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