Lymphatic System and Immunity Overview

Functions of the Immune System

• The immune system is a functional system, not a separate organ system.
• It is closely associated with the lymphatic system.
• Provides resistance to disease.
• Defends against internal and external enemies.

Defense Mechanism

• Organized like a military with patrolling defense.
• Recognizes and destroys invaders.

Two Mechanisms of Body Defense

Nonspecific Immunity

• General defense.
• Targets any pathogen, regardless of type.
• Also known as innate defenses.
• Examples:
  • Skin (barriers)
  • Fever
  • Inflammation

Specific Immunity

• Targets specific pathogens.
• Involves antibodies.

Analogy to Military

• Non-specific immunity: Deploying all troops against any enemy.
• Specific immunity: Targeting a specific individual, like a general.

Examples of Defenses

Nonspecific (Innate) Defenses

• Barriers like skin.
• Fever.
• Inflammation.

Specific Defenses

• Creating antibodies.
• Targeting specific pathogens.