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

A. Perforin

B. Granzymes

C. Lysozymes

D. Cytokines

Answer Explanation:

Perforin is released by killer cells of the immune system and is responsible in destroying target cells while granzymes are responsible for inducing death of virus-infected and other harmful cells. Lysozymes are responsible for protecting us by killing or attacking the cell walls of the bacteria. Cytokines are small proteins that help in regulating the growth and activity of other cells of the immune system and blood.

Therefore, the Correct Answer is D.

Q #1: Enhanced phagocytosis of a cell by the binding of a specific protein is called ________

A. endocytosis

B. opsonization

C. anaphylaxis

D. complement activation

Answer Explanation

Phagocytes such as macrophages have receptors for specific proteins, and they are thus able to recognize them as they are bound to the bacteria. This brings the phagocyte and bacterium into close proximity and enhances the phagocytosis of the bacterium by the process known as opsonization.
Opsonization is the tagging of a pathogen for phagocytosis by the binding of an antibody or an antimicrobial protein.
Q #2: Which of the following types of cells produce and release antibodies?

A. Cytotoxic T-cells

B. Helper T-cells

C. Natural killer cells

D. Plasma B cells

Answer Explanation

Lymphocytes fall into two classes B cells and T cells. The B cells are responsible for producing antibodies that attack foreign particles on the body. Some B cells become plasma cells.

Cytotoxic T-lymphocytes kill target cells with specific antigens while Helper T cells are responsible for activating both B lymphocytes and cytotoxic T cells. Neutrophils release cytokines that attract other defending cells to the sites of infection
Q #3: The taking in of antigen and digesting it for later presentation is called ________

A. antigen presentation

B. antigen processing

C. endocytosis

D. exocytosis

Answer Explanation

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

More Questions on TEAS 7

Q #1: Enhanced phagocytosis of a cell by the binding of a specific protein is called ________

Answer Explanation

Q #2: Which of the following types of cells produce and release antibodies?

Answer Explanation

Q #3: The taking in of antigen and digesting it for later presentation is called ________

Answer Explanation

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