Most common organ to be injured in primary blast injuries is:
**Core Concept**
Primary blast injuries occur due to the rapid release of energy from an explosion, resulting in a shockwave that can cause damage to air-filled organs and cavities. The severity of injury depends on the proximity to the blast and the intensity of the shockwave.
**Why the Correct Answer is Right**
The most common organ to be injured in primary blast injuries is the lung. This is because the blast wave compresses and then rapidly expands air-filled spaces, leading to barotrauma and alveolar rupture. The lung's delicate alveolar structure and its role in gas exchange make it particularly susceptible to damage from blast waves. The force exerted by the blast wave can also cause the lung to collapse, leading to respiratory distress.
**Why Each Wrong Option is Incorrect**
**Option A:** The stomach is not the most common organ to be injured in primary blast injuries, although it can be affected due to the blast wave causing increased intra-abdominal pressure.
**Option B:** The heart is not typically the most common organ to be injured in primary blast injuries, as it is a solid organ and less susceptible to damage from blast waves.
**Option C:** The liver is not the most common organ to be injured in primary blast injuries, as it is a solid organ and protected by its location in the abdominal cavity.
**Clinical Pearl / High-Yield Fact**
Remember that primary blast injuries can cause damage to air-filled organs and cavities, and the lung is the most susceptible due to its delicate structure and role in gas exchange.
**Correct Answer:** C. Lung.