What is the function of the spleen?
tissue repair
hematopoiesis
red blood cell and platelet destruction
blood reservoir
all of the above
The Correct Answer is E
A. tissue repair: The spleen can act as a site for monocytes that aid in tissue healing and immune response.
B. hematopoiesis: While primarily occurring in the bone marrow, the spleen performs hematopoiesis during fetal development and can resume it in adults under certain disease conditions.
C. red blood cell and platelet destruction: The spleen is often called the "red blood cell graveyard" because it filters out and breaks down old or damaged cells.
D. blood reservoir: The spleen can store a significant volume of blood (specifically platelets and RBCs) to be released into circulation if needed.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. disaccharide: These are "double sugars" (like sucrose) that must be broken down further into single units before absorption.
B. monosaccharide: This is the simplest form of sugar (like glucose). The digestive system breaks all complex carbs down into monosaccharides so they can be absorbed into the bloodstream.
C. polysaccharide: These are complex carbs (like starch). Digestion starts with these; it doesn't end with them.
D. fatty acid: These are the end products of fat (lipid) digestion, not carbohydrates.
Correct Answer is B
Explanation
A. They accelerate chemical reactions: This is true; enzymes are biological catalysts that speed up reactions by lowering activation energy.
B. They change chemically and are in the end products: Catalysts are not consumed or permanently altered by the reaction; they are released to be used again.
C. They are vital to chemical reactions: Most metabolic processes would occur too slowly to sustain life without them.
D. Many contain vitamins in their structure: Many enzymes require cofactors or coenzymes (often derived from vitamins) to function.
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