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. A by-product of protein catabolism is called__________.

A.

azotemia

B.

creatinine

C.

uric acid

D.

urea

Answer and Explanation

The Correct Answer is D

A. Azotemia is a condition characterized by elevated levels of nitrogenous waste products in the blood, not a direct by-product of protein catabolism.

B. Creatinine is a by-product of muscle metabolism, not directly from protein catabolism.

C. Uric acid is a by-product of nucleic acid metabolism, not protein catabolism.

D. Urea is a primary by-product of protein catabolism, formed in the liver and excreted by the kidneys. This is the correct answer.


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Related Questions

Correct Answer is D

Explanation

A. Corpuscle: The corpuscle refers to the glomerulus and Bowman's capsule, not the medial concavity of the kidney.

B. Cortex: The cortex is the outer region of the kidney, not the medial concavity.

C. Medulla: The medulla refers to the inner part of the kidney but not specifically the medial concavity.

D. Hilum: The hilum is the medial concavity of the kidney where blood vessels, nerves, and the ureter enter and exit.

Correct Answer is B

Explanation

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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