Question Detail
Question
Gills consist of threadlike structures called ______, and each contain a capillary network called ______.
Correct Answer
Option A is the correct answer.
Detailed Explanation
Gills are composed of gill filaments, which are threadlike structures. These filaments, in turn, bear numerous tiny, plate-like structures called gill lamellae, where the actual gas exchange with the blood in the capillary network occurs.
Hint
Recall the hierarchical structure of a fish gill.