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Difficulty: EasyHuman Anatomy and Body Systems

Within the human vascular network, metabolic wastes and nutrients diffuse across single-cell-thick walls directly into surrounding interstitial fluid. Which blood vessels perform this exchange function?

  1. A
    Elastic arteries
  2. CapillariesAnswer
  3. C
    Systemic veins
  4. D
    Lymphatic vessels

Answer

Capillaries are the microscopic vessels responsible for direct gas, nutrient, and waste exchange with body tissues.
Capillaries have walls consisting of a single layer of endothelial cells, providing the minimal diffusion distance needed for the rapid exchange of oxygen, carbon dioxide, glucose, and metabolic byproducts between blood and interstitial fluid.

Step-by-Step Solution

1
Identify the functional requirement stated in the question
The target blood vessel must have single-cell-thick walls to permit direct diffusion of gases and metabolic substances with surrounding tissues.
Thin barriers are required for efficient diffusion across membranes according to physiological transport principles.
2
Evaluate the structural characteristics of the blood vessel types
Arteries and veins feature multi-layered, thick walls for bulk transport, whereas capillaries consist solely of a thin endothelial layer.
Only capillaries possess the structural adaptation necessary for microvascular exchange.

Key Concept

Microvascular exchange across capillary endothelium in the human circulatory system
Estimated Time:40s
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Topics

Human Anatomy and Body Systems

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