Blood Cells and the Immune System

This article discusses the different types of blood cells and their roles in the immune system. Platelets, neutrophils, eosinophils, basophils, lymphocytes, and monocytes are all important for fighting infection and maintaining health.

Questions

• What are the different types of blood cells?
• What are the roles of platelets, neutrophils, eosinophils, basophils, lymphocytes, and monocytes in the immune system?
• How do blood cells fight infection?

Answers

• There are five types of blood cells: platelets, neutrophils, eosinophils, basophils, lymphocytes, and monocytes.
• Platelets help to clot blood and prevent bleeding. Neutrophils are phagocytic cells that engulf and destroy bacteria. Eosinophils release enzymes that can kill parasites. Basophils release histamine, which causes allergic reactions. Lymphocytes produce antibodies that fight infection. Monocytes differentiate into tissue macrophages, which can engulf and destroy foreign particles.
• Blood cells fight infection by engulfing and destroying bacteria, parasites, and other foreign particles. They also release enzymes and antibodies that can kill or disable these invaders.