Immune System Practice Test

Where are most plasma proteins located?

Spleen Kidney Liver Lymph nodes

Correct Answer:

Liver

Explanation:

The main idea here is where the body makes most of its plasma proteins. The liver is the primary source. Hepatocytes produce albumin, which makes up about the majority of the total plasma proteins and is crucial for maintaining oncotic pressure that keeps fluid inside blood vessels. The liver also synthesizes many clotting factors (such as fibrinogen and others) and a range of transport and defense proteins. Because these proteins circulate in plasma and uphold essential functions like fluid balance and coagulation, most plasma proteins originate from the liver. The other tissues listed have important roles in immune function and filtration, but they are not the main sites of plasma protein production.

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