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Which organ removes old or damaged red blood cells and pathogens within the blood?

A.

Bone marrow

B.

Tonsils

C.

Thymus

D.

Spleen

Answer and Explanation

The Correct Answer is D

A. Bone marrow: The bone marrow is primarily responsible for the production of blood cells, including red blood cells, rather than their removal.

B. Tonsils: The tonsils are part of the immune system and help filter pathogens but are not primarily involved in removing old red blood cells.

C. Thymus: The thymus is involved in the maturation of T-lymphocytes (T-cells) and does not have a role in filtering blood or removing red blood cells.

D. Spleen: The spleen filters the blood, removes old and damaged red blood cells, and helps in the immune response by filtering pathogens.


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Related Questions

Correct Answer is A

Explanation

A. Cystic duct: The cystic duct connects the gallbladder to the bile ducts and allows bile to flow into and out of the gallbladder.

B. Common hepatic duct: This duct carries bile from the liver but does not directly lead to the gallbladder.

C. Pancreatic duct: This duct transports digestive enzymes from the pancreas to the duodenum, not bile.

D. Left hepatic duct: This carries bile from the left side of the liver and eventually merges into the common bile duct, but it does not lead directly to the gallbladder.

Correct Answer is B

Explanation

A. Pancreas: pancreas secretes enzymes such as amylase (for carbohydrate digestion), lipase (for fat digestion), and proteases (such as trypsin and chymotrypsin for protein digestion). These enzymes are secreted into the small intestine to aid in the digestion of chyme.

B. Stomach: Chyme is a semi-fluid mixture of partially digested food and digestive juices formed in the stomach. The stomach’s muscular contractions mix food with gastric secretions, resulting in this thick paste that is then gradually released into the small intestine for further digestion.

C. Small Intestine: While the small intestine further processes chyme through digestion and absorption, it does not produce it.

D. Large Intestine: The large intestine primarily absorbs water and electrolytes from indigestible food matter and forms waste, but it does not produce chyme.

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