The structures labeled 3 refer to:

Name: The structures labeled 3 refer to:
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Question

Quizplus · Accepted Answer

The structures labeled 3 appear to be small sac-like structures, which are characteristic of alveoli in the lungs. Glands typically have ducts that allow substances to be secreted, while ampulla refers to specific structures such as the ampulla of Vater in the digestive system. Lobes are larger structural units within organs such as the brain and liver. Therefore, C) alveoli is the best choice for the given structures.

The Structures Labeled 3 Refer To