What must be used under a hood because it readily vaporizes and will fix nasal mucosa?

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Multiple Choice

What must be used under a hood because it readily vaporizes and will fix nasal mucosa?

Explanation:
The key idea is that some fixatives are so volatile and dangerous that they must be used in a fume hood to prevent harmful vapors from being inhaled. Osmium tetroxide readily vaporizes and, if its vapors are inhaled, can fix nasal mucosa in place, causing severe irritation or injury. This strong volatility and reactivity with tissue, especially with lipids, is why it is handled under a hood with proper ventilation and protective equipment. While other fixatives like formalin or Bouin’s can also be hazardous, osmium tetroxide’s vapors pose a unique risk of fixing mucosal tissue in the nose, making the hood a safety necessity.

The key idea is that some fixatives are so volatile and dangerous that they must be used in a fume hood to prevent harmful vapors from being inhaled. Osmium tetroxide readily vaporizes and, if its vapors are inhaled, can fix nasal mucosa in place, causing severe irritation or injury. This strong volatility and reactivity with tissue, especially with lipids, is why it is handled under a hood with proper ventilation and protective equipment. While other fixatives like formalin or Bouin’s can also be hazardous, osmium tetroxide’s vapors pose a unique risk of fixing mucosal tissue in the nose, making the hood a safety necessity.

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