What type of tissue is shown at the arrow?
Simple squamous epithelium
Stratified squamous epithelium
Transitional epithelium
Adipose tissue
The Correct Answer is D
A. Simple squamous epithelium: Simple squamous epithelium consists of a single layer of flat cells, specialized for diffusion and filtration (e.g., alveoli, capillaries). It does not provide the protective layering needed in the vaginal canal.
B. Stratified squamous epithelium (non-keratinized): The vaginal canal is lined with non-keratinized stratified squamous epithelium. This multilayered tissue provides protection against friction and mechanical stress during intercourse and childbirth, while remaining moist and flexible.
C. Transitional epithelium: Transitional epithelium is found in the urinary bladder and ureters, where it allows stretching. It is not present in the vaginal canal.
D. Adipose tissue: The tissue shown at the arrow in the anatomical model is adipose tissue (commonly known as fat).The yellow, pebbled, or "honeycomb" texture is the standard representation of fat deposits on medical models.
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Related Questions
Correct Answer is C
Explanation
A. Basal Cell Carcinoma: This is the most common and least likely to spread (metastasis). It typically appears as a pearly or waxy bump, unlike the pigmented, irregular lesions shown.
B. Squamous Cell Carcinoma: While more aggressive than basal cell, it is usually less dangerous than melanoma. It often presents as a firm, red nodule or a flat lesion with a scaly surface.
C. Melanoma: This is the most severe and deadly form of skin cancer because it is highly likely to spread to other organs. The image displays the classic warning signs: Asymmetry, irregular Borders, multiple Colors, large Diameter, and Evolving/Changing.
D. Actinic Keratosis: This is a precancerous skin growth caused by sun damage. It is not yet a malignant cancer, though it can develop into squamous cell carcinoma if left untreated.
Correct Answer is D
Explanation
A. Stratified squamous epithelium: Found in areas subject to friction (skin, esophagus), not in alveoli.
B. Transitional epithelium: Found in the urinary bladder, specialized for stretching, not gas exchange.
C. Cuboidal epithelium: Found in kidney tubules and glandular tissue, not in alveoli.
D. Simple squamous epithelium: The alveoli of the lungs are lined with simple squamous epithelium. These cells are extremely thin and flat, allowing for rapid diffusion of gases (oxygen and carbon dioxide) between the alveolar air and the surrounding capillaries. Their delicate structure is essential for efficient gas exchange, which is the primary function of the lungs.
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