Which of the following chemicals is released by one type of immune cell to directly activate another immune cell?

Rationale

Cytokines are released by one type of immune cell to directly activate another immune cell.

Cytokines are a broad category of small proteins that are important in cell signaling. They are released by various immune cells and act by binding to specific receptors on the target cells, thereby activating them.

A (lysozymes) YOUR ANSWER

Lysozymes are enzymes that break down the cell walls of bacteria, acting as an antimicrobial agent. They do not directly activate immune cells, but rather, they work to destroy invading pathogens.

B (cytokines) CORRECT

Cytokines are small proteins released by immune cells that act as messengers between cells. They function by binding to specific cytokine receptors on the surface of other immune cells, activating various cell functions such as proliferation, differentiation, and cell death. This intercellular communication is crucial for coordinating an effective immune response.

C (perforin) YOUR ANSWER

Perforin is a protein produced by cytotoxic T cells and natural killer cells that forms pores in the membranes of targeted cells, leading to their destruction. While perforin plays a significant role in the immune response, it does not directly activate other immune cells.

D (granzymes) YOUR ANSWER

Granzymes are serine proteases released by cytotoxic lymphocytes upon contact with a target cell. While they contribute to the immune response by inducing apoptosis in target cells, they do not directly activate immune cells.

Conclusion

Among the given options, only cytokines are released by immune cells to directly activate other immune cells. Lysozymes act as antimicrobial agents and do not activate immune cells. Both perforin and granzymes are involved in the destruction of target cells but do not directly activate other immune cells. Therefore, cytokines are the correct answer as they play a crucial role in the intercellular communication within the immune system.

Which of the following chemicals is released by one type of immune cell to directly activate another immune cell?

Cytokines are released by one type of immune cell to directly activate another immune cell.

Related Questions

Related Quizzes

How familiar were you with this question?

Report an Issue

Rate this Practice Test