HESI A2 Anatomy and Physiology Practice Exam

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Question 1

Which of the following epithelial types is correctly matched with its major function?

Your Answer: Option(s)

Correct Answer: Option(s) D

Rationale

Simple columnar epithelium is correctly matched with its major function of secretion or absorption.

Simple columnar epithelium is primarily involved in secretion and absorption, particularly in the gastrointestinal tract, where it facilitates the uptake of nutrients and the secretion of digestive enzymes and mucus.

A) Simple squamous epithelium—secretion or absorption
Simple squamous epithelium is primarily associated with diffusion and filtration due to its thin, flat structure, which allows substances to pass easily across it. It is commonly found in areas such as the alveoli of the lungs and the lining of blood vessels, where rapid exchange is critical, rather than in secretion or absorption.

B) Stratified squamous epithelium—changes shape when stretched
Stratified squamous epithelium is designed for protection against mechanical stress and abrasion, not for changing shape when stretched. This type of epithelium is typically found in areas such as the skin, mouth, and esophagus, where multiple layers provide a barrier against environmental damage, rather than being specialized for elasticity.

C) Stratified squamous epithelium—diffusion
Stratified squamous epithelium is not suited for diffusion; instead, it serves a protective function. The multiple layers of cells in this epithelium provide a robust barrier, making it ineffective for the exchange of substances. Diffusion is better facilitated by simpler epithelial types, such as simple squamous epithelium.

Conclusion
In summary, simple columnar epithelium is accurately characterized by its primary functions of secretion and absorption, particularly within the digestive system. The other epithelial types listed do not match their respective functions correctly, emphasizing the importance of understanding the specific roles of different epithelial forms in the body.

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Simple columnar epithelium is correctly matched with its major function of secretion or absorption.

The shoulder is a ball and socket joint.

Antidiuretic hormone is not a tropic hormone.

Nucleotides are the building blocks of macromolecules that carry the genetic code.

Xiphoid bone is located on the sternum.

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Simple columnar epithelium is correctly matched with its major function of secretion or absorption.

The shoulder is a ball and socket joint.

Antidiuretic hormone is not a tropic hormone.

Nucleotides are the building blocks of macromolecules that carry the genetic code.

Xiphoid bone is located on the sternum.

Free Preview Ended

Unlock Full Access

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