 
 <translate> To answer this question, we should know that: The pyramids appear striped because they are formed by straight parallel segments of nephrons and collecting ducts.
Therefore, the answer is because they are formed by straight parallel segments of nephrons and collecting ducts. <ibo> Iji zaa ajụjụ a, anyị kwesịrị ịmara nke a: A na-ahụ pyramid ndị ahụ dị ka hà nwere ahịhịa n'ihi na e ji nephrons na ọwa mmiri ndị na-achịkọta ihe ndị dị n'ahụ́ ha kpụọ ha. N'ihi ya, azịza ya bụ n'ihi na ọ bụ akụkụ nke nephrons na ducts na-ekpokọta ihe na-eme ka ha dịrị n'otu. 