The structure which is highlighted is the pulmonary arterioles.
What do you mean by Structure?
A structure may be defined as any systematic representation of any object or thing in a visible manner.
Pulmonary arterioles are the terminal branches of the mammalian pulmonary arterial tree. These arterioles do not consist of smooth muscles. The specific role of the pulmonary arteries is to carry blood that's low in oxygen and high in carbon dioxide waste to the pulmonary capillaries of the lungs, where this exchange takes place.
Therefore, the structure which is highlighted is the pulmonary arterioles.
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