Physiology of Neutrophils, Macrophages, and Dendritic Cells

The video provides an overview of the innate immune system, focusing on the roles of neutrophils, macrophages, and dendritic cells. Neutrophils are described as primary phagocytes that attack pathogens through phagocytosis. Macrophages and dendritic cells also perform phagocytosis and are involved in antigen presentation, which helps identify and target specific pathogens. The video explains the process of diapedesis and the physical characteristics of these immune cells, highlighting their importance in the body's defense mechanisms.

What is the primary characteristic of the innate immune system?

• It only targets specific pathogens.

• It adapts to new pathogens over time.

• It requires prior exposure to pathogens.

• It is present at birth and acts immediately.

What is the process called when neutrophils move through blood vessel walls to reach an infection site?

• Phagocytosis

• Diapedesis

• Exocytosis

• Antigen presentation

How do neutrophils primarily destroy bacteria?

• Through antigen presentation

• By releasing antibodies

• Through phagocytosis

• By producing antigens

Which cells are derived from monocytes and are involved in antigen presentation?

• T cells

• B cells

• Macrophages and dendritic cells

• Neutrophils

What is the role of antigen presentation in the immune response?

• To initiate diapedesis

• To produce antibodies

• To signal other immune cells about a specific pathogen

• To destroy pathogens directly

What is a distinguishing feature of neutrophils under a microscope?

• Absence of granules

• Multilobed nucleus

• Round nucleus

• Kidney bean-shaped nucleus

Which cells are known as granulocytes due to the presence of granules in their cytoplasm?

• Dendritic cells

• Macrophages

• Neutrophils

• Monocytes