Immune system - adaptive immunity

Which fluid is lymph most similar to?

• Interstitial fluid

• Blood plasma

• Mucus

• Sweat and tears

What is an antigen?

• A small molecule, that is not normally present in the body

• A large molecule that is not normally present in the body

• A small virus or bacteria not usually present in the body

• A large virus or bacteria not usually present in the body

Where are B and T cells made?

• Thymus

• Lymph node

• Bone

• Blood

What is meant by a naïve B or T cell?

• Its still developing its immunocompetence

• Its moving in the lymphatics system after been activated by its antigen

• Its moving in the lymphatics system but has not met its antigen

• Its met an reacted to an antigen but has yet to clone itself.

Upon meeting or being presented an antigen, B cells...

• Clone themselves and become plasma cells which make antibodies

• Clone themselves and become memory cells which make antibodies

• Become cytotoxic T cells which seek out and destroy infected cells

• Become cytotoxic T cells which help other cells destroy infections

How do cytotoxic T cells destroy infected/cancerous cells?

• Release free radicals onto the cell

• Insert pore like structures called Perforins into their membranes

• Engulf the cell by phagocytosis

• Release antibodies which cause the cell to burst.