Examine the structure of blood vessels in the following figure.Which one of the following has the structure best suited to chemical exchange between the blood and tissues? 
Definitions:
Red
A color at the end of the visible spectrum, often associated with danger, passion, or excitement.
Pressure Ulcers
Injuries to skin and underlying tissue resulting from prolonged pressure on the skin, commonly affecting bedridden or immobile individuals.
Quadriplegia
A condition characterized by the paralysis of all four limbs, typically resulting from injury or illness affecting the spinal cord.
Skin Excoriations
Damage or removal of part of the surface of the skin typically due to scratching or rubbing.
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