Biology Quiz: Immune Cells

Mobile Cells

• Characterized by a granule-filled cytoplasm.
• Typically located near blood vessels.
• Secrete heparin to prevent blood clotting.
• Release histamine, which causes blood vessel dilation and increases blood flow.

Plasma Cells

• Develop from B-lymphocytes when activated by foreign materials.
• Function as small "factories" producing antibodies, which are critical for immune defense.
• Antibodies bind to foreign substances, preventing further harm and assisting in their elimination.
• Commonly found in the intestinal wall.

Histology Overview

• Histology is the study of tissues and their arrangement to form organs.
• The term derives from Greek: "histo" (tissue) and "logos" (study).

Tissue Composition

• Tissues comprise two main components: cells and extracellular matrix (ECM).
• Initially regarded as separate, the ECM plays a crucial role in tissue structure and function.

Extracellular Matrix (ECM)

• The ECM includes various molecules, some organized into complex structures like collagen fibrils and basement membranes.
• Functions of the ECM include:
  • Providing mechanical support for cells.
  • Facilitating nutrient transport to cells.
  • Removing metabolic waste and secretory products.

Cellular Interaction

• Cells not only synthesize ECM components but are also affected by them, indicating a dynamic relationship.

Organ Formation

• Most organs consist of multiple tissue types working together, with the exception of the central nervous system, primarily made up of nervous tissue.

Microscopy in Histology

• The microscopic size of cells and matrix components necessitates the use of microscopes for histological study.

Test your knowledge on the role and characteristics of mobile cells and plasma cells in the immune system. This quiz covers the functions of heparin, histamine, and antibodies in response to foreign materials. Prepare to enhance your understanding of these vital immune components.