The following diagram is of a cross-section of a plant leaf. Use the diagram to answer the question. 
-The main function associated with structure Y is ________.
Definitions:
Preventing Pain
Strategies and practices aimed at minimizing or avoiding the onset of pain.
Opioid Use
The medical or recreational use of substances primarily for their pain-relieving properties, which can lead to dependence and other health issues.
Interactive Method
A technique or approach that involves active participation and engagement between two or more parties to facilitate learning, understanding, or problem-solving.
Self-Administration
The act of a person taking medication or treatment independently, without professional assistance.
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