The light red layer between the white lumen and blue lamina propria consist of epithelium cells.
<h3>What is a lamina propria?</h3>
A lamina propria is a type of connective tissue that is present and found  under the thin layer of tissues covering a mucous membrane.
<h3 /><h3>Characteristics of the lamina propria</h3>
- It is a very large layer of connective tissue
- It divides the innermost layer from a layer of smooth muscle tissue.
- it is a light red layer barrier located between the white lumen and blue lamina.
- It is made up of epithelium cells.
- It is also found in the respiratory tract, the Gastrointestinal tract, and the urogenital tract.
Thus, the light red layer between the white lumen and blue lamina propria consist of epithelium cells.
Learn more about epithelial cells here:
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Ligament is a fibrous connective tissue which joins the bone to bone. It helps to keep the skeletal system in structure and provide stability to the skeletal system.
        
             
        
        
        
Answer:
In quiet breathing inspiration involves muscular contractions and expiration is passive.
Explanation:
Respiration process involves two different stages, inspiration - inhalation- and expiration - exhalation-. 
During inspiration, the diaphragm <u>contracts</u> and goes down, while intercostal muscles also <u>contract</u> and go up. These actions enhance the size of the thoracic box and <u>reduce internal pressure</u>. As a result, air flows in and fills the lungs. 
During expiration, the <u>diaphragm relaxes</u> and the volume of the thoracic box diminishes, which causes the <u>pressure inside to increase</u>. In consequence, the lungs contract and the air is expulsed outside.  
 
        
             
        
        
        
A. prevent cross-contamination.