phagocytic cells Flashcards
What are phagocytic cells?
Cells that can engulf and digest foreign particles, bacteria, and dying cells.
True or False: Phagocytic cells are a type of immune cell.
True
Which of the following is a primary type of phagocytic cell? (A) Neurons (B) Macrophages (C) Erythrocytes
B) Macrophages
Fill in the blank: Phagocytosis is the process by which phagocytic cells ______ foreign particles.
engulf
What is the role of neutrophils in the immune response?
Neutrophils are the first responders to sites of infection and are key players in phagocytosis.
True or False: Dendritic cells are involved in antigen presentation after phagocytosis.
True
What is the main function of macrophages?
To engulf and digest pathogens, dead cells, and debris.
Which type of phagocytic cell is known for its role in chronic inflammation?
Macrophages
What is the term for the recognition of pathogens by phagocytic cells?
Pattern recognition
Fill in the blank: Phagocytic cells can be activated by ______, which enhances their ability to fight infections.
cytokines
What type of immune response do phagocytic cells primarily participate in?
Innate immune response
True or False: Phagocytic cells can only ingest bacteria.
False
What is the process called when phagocytes move towards a chemical signal?
Chemotaxis
Which phagocytic cells are derived from monocytes?
Macrophages and dendritic cells
What is the role of lysosomes in phagocytic cells?
To contain enzymes that digest engulfed materials.
Fill in the blank: The process of phagocytosis involves the formation of ______ around the particle.
phagosome
What is the function of the phagolysosome?
To fuse the phagosome with lysosomes for digestion of the engulfed material.
Which phagocytic cell is primarily involved in the clearance of apoptotic cells?
Macrophages
True or False: Phagocytosis can only occur in the presence of antibodies.
False
What do we call the ability of phagocytic cells to recognize and bind to pathogens?
Opsonization
Which cytokine is known to enhance the phagocytic activity of neutrophils?
Interleukin-8 (IL-8)
Fill in the blank: During an immune response, phagocytic cells can produce ______ to recruit more immune cells.
chemokines
What is the significance of phagocytic cells in tissue repair?
They help clear debris and promote healing by releasing growth factors.
True or False: Phagocytic cells are only important during infections.
False
What is the function of eosinophils in relation to phagocytosis?
Eosinophils are involved in the defense against parasites and play a role in allergic reactions.
Which type of phagocytic cell is most abundant in the bloodstream?
Neutrophils
