Phagocytosis and Immune Response Concepts

Phagocytosis involves phagocytes being attracted to invasion sites by chemical signals. They attach to microorganisms using surface receptors, a process enhanced by opsonization. The microorganisms are engulfed into a phagosome, which fuses with lysosomes to form a phagolysosome where digestion occurs. Finally, the digested contents are expelled by exocytosis.

What attracts phagocytes to the site of invasion?

• Magnetic fields

• Sound waves

• Light signals

• Chemical signals from microorganisms

Which of the following is NOT a surface receptor involved in phagocyte attachment?

• Chlorophyll

• Complement receptor

• Lipopolysaccharide

• Antibody

What is the process called that enhances phagocytosis by coating microorganisms?

• Fermentation

• Respiration

• Photosynthesis

• Opsonization

What forms when a phagocyte engulfs a microorganism?

• Nucleus

• Mitochondrion

• Phagosome

• Lysosome

What do lysosomes release into the phagosome?

• Carbon dioxide

• Oxygen

• Water

• Digestive enzymes

How are the digested contents of the phagolysosome eliminated from the phagocyte?

• Exocytosis

• Endocytosis

• Diffusion

• Osmosis