Which part is included in the first order of viscera putrefaction?

• A. Trachea and larynx
• B. Uterus and large blood vessels
• C. Brain and spinal cord
• D. Heart and lungs

Answer: (A)

The key idea here is that putrefaction of viscera progresses in stages, starting with structures that are most exposed to air and have mucosal surfaces that microbes can rapidly colonize. The trachea and larynx fit this pattern, being the upper airway passages with mucosa that harbors bacteria. After death, those bacteria begin producing gases and breakdown products in these tissues, so the trachea and larynx show early signs of putrefactive change, marking the first stage.

In contrast, the uterus and large blood vessels are deeper in the body and less immediately exposed to environmental microbes, the brain and spinal cord are protected within the skull and decompose under different timing dynamics, and the heart and lungs, while significant viscera, tend to show subsequent changes once microbial spread progresses.