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Zorluk: KolayHuman 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. CapillariesCevap
  3. C
    Systemic veins
  4. D
    Lymphatic vessels

Cevap

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.

Adım Adım Çözüm

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.

Anahtar Kavram

Microvascular exchange across capillary endothelium in the human circulatory system
Tahmini Süre:40s
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Human Anatomy and Body Systems

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