Match each description with the appropriate type of T cell. Any answer may NOT b
ID: 3524390 • Letter: M
Question
Match each description with the appropriate type of T cell. Any answer may NOT be used more than once Question 29 options Long lived T cells that can carry out a secondary response Play a major role in cell-mediated immunity as well as in the humoral Suppressor T cells (Ts Delayed hypersensitivity T cells (Td) Cytotoxic (killer) T cells (Tc) memory T cells mmune response. Natural killer cells (NK) r allergies occurring Responsible fo several hours days after contact. Act mainly on virally infected cells. Releases perform when bound to target cell, killing it. . T-helper cells Regulate immune reactions by limiting the extent of antibody production blocking some T-cell activity andExplanation / Answer
Cytotoxic T cells:act mainly on viral infected cells.release perforins when bound to target cell and kill it.
Explanation: these cells directly attack and destroy antigens by secreting a protein perforin which results in the lysis of target cells and cancer cells.They have CD8 markers on their surface.
Memory T cells:long lived T cell that can carry out secondary response.
Explanation: These are sensitized T cells which retain memory of antigen specificity for future, sometimes life long.These cells recognise the invaders readily and attack them.
Helper T cells: plays a major role in cell mediated immunity and humoral immunity response.
Explanation: they help in overall regulation of immunity by forming a series of protein mediators called lymphokines.They have CD 4 markers on their surface.
Suppressor T cells:regulate immune reactions by limiting the extent of antibody production and blocking some T cell activity.
Explanation: these check on entire system from attacking the body s own cells.
Delayed hypersensitivity: responsible for allergies occurring several hours /days after contact.
Explanation: The exaggerated immune response to certain antigens present in the environment is called hypersensitivity.
Natural killer cells: (NKcells): These are the lymphocytes that cause lysis of viral infected cells and tumor cells.They produce perforins which cause pores in the target cells allowing entry of water,resulting in the lysis.NK cells are very important in natural resistance to tumors.