Question

the text describes helper t cells as the managers of the immune response. which of their functions best justifies this title? they secrete cytokines that activate and control the activities of other lymphocytes. they directly destroy virus - infected cells by releasing toxins. they end the immune response once an infection has been curbed. they engulf pathogens and display their antigens to activate other cells. many vaccines work by introducing a weakened or inactivated form of a pathogen into the body. based on the functions described in the text, how does this process provide long - term protection? it allows the adaptive immune system to recognize the pathogens antigens and develop amemory, enabling a much faster and stronger response to a future infection. it causes the innate immune system to permanently increase the number of circulating leukocytes that perform phagocytosis. it trains glial cells in the neuroimmune system to identify and attack the pathogen before it can reach the peripheral body. it permanently strengthens the skin and mucous membranes to prevent any future invasion by that pathogen.

Explanation:

1. Helper T - cells secrete cytokines which regulate other lymphocytes, similar to managers controlling processes. The other options describe functions of other immune - cells.
2. Vaccines work by introducing weakened or inactivated pathogens, which allows the adaptive immune system to create a'memory' of the pathogen's antigens for a faster and stronger future response. The other options misattribute the mechanism of vaccine action to other immune processes.

Answer:

1. They secrete cytokines that activate and control the activities of other lymphocytes.
2. It allows the adaptive immune system to recognize the pathogen's antigens and develop a "memory," enabling a much faster and stronger response to a future infection.