# 🩸 Capil

Notes

# 🩸 Capillary Exchange ## Introduction - Focus on the process of capillary exchange within the blood vessel series. - Capillaries allow blood flow at a slow rate, which is crucial for efficient exchange. ## Importance of Slow Blood Flow - Slow movement through capillaries allows for: - Effective exchange of oxygen and carbon dioxide. - Nutrient delivery and waste removal. ## Mechanism of Exchange - Major process involved in capillary exchange is **diffusion** . - Definition of diffusion: movement of substances from high concentration areas to low concentration areas. #### "Diffusion is when a substance travels from a high concentration to a low concentration. " ### Types of Diffusion in Capillaries - Diffusion categories based on substance solubility: 1. **Lipid-soluble substances**: Easily pass through the capillary membrane due to fat-solubility. 2. **Water-soluble substances**: Do not pass through membranes directly; transport methods include: - - **Intercellular cleft**: Small gaps between cells. **Fenestrations**: Pores in fenestrated capillaries. 3. **Large substances**: - Transported via **vesicles** through engulfment and exocytosis. ## Alternative Transport Method: Bulk F...