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:
Down's Syndrome
A genetic disorder caused by the presence of an extra 21st chromosome, leading to developmental and physical differences.
Cardiovascular Problems
Cardiovascular problems refer to any disease or condition affecting the heart and blood vessels, often related to atherosclerosis or hypertension.
Cognitive Development
The process through which individuals acquire and evolve their thinking abilities, including problem-solving and decision-making, throughout the lifespan.
Alleles
Variations of a gene found at the same locus on a chromosome, which determine divergent traits that can be passed to offspring.
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