What is the open cavity of the digestive tract that contains the digested food molecules? A. Muscularis B. Mucosa C. Serosa D. Lumen

Breakdown of the Problem

1. Identify what is being asked: the term for the open cavity in the digestive tract.
2. Consider the options provided: Muscularis, Mucosa, Serosa, Lumen.

Relevant Concepts

• Muscularis: A layer of muscle in the digestive tract responsible for movement.
• Mucosa: The innermost layer lining the digestive tract that secretes mucus and enzymes.
• Serosa: The outermost layer, a protective membrane.
• Lumen: The hollow space within the digestive tract where food passes through and is digested.

Analysis and Detail

• The Muscularis is important for the movement of food but does not hold food.
• The Mucosa facilitates interaction with food but is not an open cavity.
• The Serosa is primarily for protection and structural support and does not contain food.
• The Lumen, however, is the space where the digested food molecules reside as they move through the digestive system.

Verify and Summarize

Based on the definitions and functions of each option, the only term that refers to the open cavity of the digestive tract containing digested food molecules is "Lumen."

Final Answer

D. Lumen