Which of the following chemicals is released by one type of immune cell to directly activate another type of immune cell?
A. Cytokines B.
B. Lysozymes C.
C. Perforin D.
D. Granzymes.
Cytokines.
Cytokines are chemicals released by one type of immune cell to directly activate another type of immune cell.
They are small proteins that act as messengers between cells and play a key role in regulating the immune response.
Choice B.
Lysozymes is not the correct answer because lysozymes are enzymes that break down bacterial cell walls and do not directly activate other immune cells.
Choice C.
Perforin is not the correct answer because perforin is a protein that forms pores in the membranes of target cells and does not directly activate other immune cells.
Choice D.
Granzymes is not the correct answer because granzymes are enzymes that enter target cells and trigger apoptosis (cell death) and do not directly activate other immune cells.
Therefore, the Correct Answer is A.
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