Future Farmers of America (FFA) Vet Science CDE 2025 – 400 Free Practice Questions to Pass the Exam

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If the granules in an anesthesia machine canister are turning purple, what does this usually indicate?

The granules are more than 90 days old.

The granules have lost the ability to absorb anesthetic gases.

The granules should be turned over in the canister - they will regain.

The granules have lost the ability to absorb carbon dioxide.

When the granules in an anesthesia machine canister turn purple, it typically indicates that the granules have lost their ability to absorb carbon dioxide effectively. The granules, which usually contain substances like calcium hydroxide, are designed to capture and neutralize carbon dioxide exhaled by the patient. When they change color to purple, it signifies that the chemical reaction that enables them to absorb carbon dioxide is no longer occurring effectively, and they may need to be replaced to ensure safe anesthesia practice.

This change in color is a visual cue for veterinary professionals, indicating that the canister is no longer functioning as intended, which is critical for maintaining appropriate levels of carbon dioxide and ensuring the safety and efficiency of the anesthesia process.

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