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What is the least common but most dangerous form of lung cancer?

A.

Small-cell carcinoma

B.

Adenocarcinoma

C.

Squamous cell carcinoma

D.

Mesothelioma

E.

Basal cell carcinoma

Answer and Explanation

The Correct Answer is A

A. Small-cell carcinoma: Small-cell lung carcinoma (SCLC) is the least common type of lung cancer but is highly aggressive. It grows rapidly, often metastasizes early, and is strongly associated with smoking. Its prognosis is generally poor due to late detection and rapid progression.

B. Adenocarcinoma: Adenocarcinoma is the most common type of lung cancer, especially in non-smokers. Although serious, it typically progresses more slowly than small-cell carcinoma and has a better prognosis when detected early.

C. Squamous cell carcinoma: Squamous cell carcinoma arises from the bronchial epithelium and is often linked to smoking. It is more common than small-cell carcinoma and tends to grow more slowly, making it less immediately dangerous.

D. Mesothelioma: Mesothelioma is a rare cancer of the pleura, primarily caused by asbestos exposure. While deadly, it is not classified as a primary lung carcinoma and is less common than SCLC.

E. Basal cell carcinoma: Basal cell carcinoma is a skin cancer and does not originate in the lungs. It is not relevant to pulmonary malignancies.


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Related Questions

Correct Answer is B

Explanation

A. 5%:This percentage is far too low to represent the volume of fluid returned by the lymphatic system. Only a small portion of capillary filtrate would be recovered at this rate, which would lead to significant interstitial fluid accumulation.

B. 85%:Approximately 85% of filtered fluid is reabsorbed directly at the venous end of capillaries, while the remaining 15% enters lymphatic vessels. The lymphatic system consistently retrieves this portion to prevent edema and maintain fluid balance.

C. 25%:A recovery of 25% would greatly overestimate the lymphatic contribution compared with the actual capillary reabsorption dynamics. This value does not match known physiological distribution of fluid return pathways.

D. 50%:If lymphatics recovered half of the capillary filtrate, the role of venous reabsorption would be significantly reduced, which does not reflect actual fluid handling. This percentage does not align with established cardiovascular–lymphatic physiology.

Correct Answer is A

Explanation

Mucous membranes line the respiratory, gastrointestinal, and genitourinary tracts, serving as a primary barrier against pathogens. The mucus traps microbes and particulate matter, while enzymes like lysozyme break down bacterial cell walls. Together, these defenses reduce the likelihood of infection by preventing many pathogens from entering the body.

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