. The outermost layer of the digestive tract, which is composed of a thin layer of areola tissue:
mucosa (mucous membrane)
serosa (mesentery)
muscularis externa
Submucosa
The Correct Answer is B
A. Mucosa (mucous membrane): The mucosa is the innermost layer of the digestive tract, not the outermost. It includes the epithelium, lamina propria, and muscularis mucosae.
B. Serosa (mesentery): The serosa is the outermost layer of the digestive tract in parts where it is covered by peritoneum. It consists of a thin layer of areolar tissue topped by simple squamous epithelium.
C. Muscularis externa: The muscularis externa is a layer of muscle in the digestive tract, located beneath the serosa. It is not the outermost layer.
D. Submucosa: The submucosa is a layer of connective tissue located between the mucosa and muscularis externa. It is not the outermost layer.
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View Related questions
Correct Answer is C
Explanation
A. Destroy ingested pathogens: HCl in the stomach helps destroy ingested pathogens, providing a first line of defense against infections. Therefore, this is a correct function of HCl.
B. Convert Fe3+ to Fe2+: HCl aids in the conversion of iron from its ferric (Fe3+) to ferrous (Fe2+) form, which is more easily absorbed in the intestine. Therefore, this is a correct function of HCl.
C. Emulsify lipids: Emulsification of lipids is the function of bile, not hydrochloric acid. HCl does not emulsify lipids. This is the correct answer.
D. Activate pepsinogen to pepsin: HCl activates pepsinogen, converting it to the active enzyme pepsin, which is essential for protein digestion in the stomach. Therefore, this is a correct function of HCl.
Correct Answer is C
Explanation
A. Extracellular fluid (ECF) includes all the fluid outside of cells, such as interstitial fluid, blood plasma, and lymph. However, the majority of body water is found inside the cells.
B. Blood plasma and lymph are components of the extracellular fluid. Although they contain water, they do not hold the greatest volume compared to intracellular fluid.
C. Intracellular fluid (ICF) refers to the fluid within the cells, and it constitutes the largest volume of water in the body.
D. Tissue (interstitial) fluid is part of the extracellular fluid found between cells. While it contains a significant amount of water, it does not account for the greatest volume in the body.