• Gastric Pathology in Horses:
• The equine stomach is relatively small ($8 - 15\text{ L}$) with an exceptionally tight cardiac sphincter that anatomically prevents vomiting or eructation.
• Severe primary gastric impaction or secondary fluid accumulation due to proximal small intestinal ileus causes acute gastric dilation.
• When intraluminal pressure exceeds tissue tensile strength:
• Rupture of the stomach occurs along the greater curvature.
• Leakage of fermenting gastric contents into the peritoneal cavity causes catastrophic septic peritonitis, cardiovascular collapse, and sudden death from peracute endogenous toxemic shock.
• nalysis:
• (Rupture of the stomach): Correct.

Correct option: (1) Rupture of the stomach.

• Acoustic Impedance in Diagnostic Ultrasound:
• Diagnostic ultrasonography utilizes high-frequency sound waves ($2 - 15\text{ MHz}$) that travel efficiently through homogeneous soft tissues and fluids.
• Major Physical Limitations:

• Gas: The acoustic impedance mismatch between soft tissue and gas is nearly $99.9\%$, causing total reflection and reverberation artifacts, rendering gas-filled lungs and intestines impermeable to ultrasound.
• Bone / Mineralized Tissue: Bone strongly absorbs and reflects ultrasound beams, producing an acoustic shadow that obscures all underlying distal architecture.
  • nalysis:

• (Its unable to penetrate gas-filled or bony structures): Correct primary limitation.

• Clinical Pathology of Enteric Inflammation:
• Enteritis is inflammation of the intestinal mucosal lining caused by infectious agents (rotavirus, coronavirus, Salmonella, E. coli, coccidia) or dietary irritants.
• Disruption of the mucosal architecture (villous atrophy, crypt hyperplasia, and loss of brush-border disaccharidases) results in malabsorption and hypersecretion.
• The direct, hallmark clinical manifestation of this fluid and electrolyte transport failure is profuse Diarrhea (scours), accompanied by dehydration and metabolic acidosis.
• nalysis:
• (Diarrhea): Correct primary clinical sign.

Correct option: (2) Diarrhea