All of the following proteins are synthesized by liver, EXCEPT:
**Core Concept**
The liver plays a crucial role in synthesizing various proteins essential for maintaining homeostasis and regulating metabolic processes. These proteins include clotting factors, albumin, and transport proteins. This question requires knowledge of liver function and protein synthesis.
**Why the Correct Answer is Right**
The liver synthesizes numerous proteins, including clotting factors (e.g., prothrombin, fibrinogen), albumin, and transport proteins (e.g., lipoproteins). These proteins are vital for maintaining blood volume, transporting lipids, and facilitating blood coagulation. The liver's ability to synthesize these proteins is essential for maintaining overall health.
**Why Each Wrong Option is Incorrect**
**Option A:** (Insulin) - Incorrect because insulin is synthesized by the beta cells of the pancreas, not the liver.
**Option B:** (Fibrinogen) - Incorrect because fibrinogen is indeed synthesized by the liver, making it a distractor.
**Option C:** (Albumin) - Incorrect because albumin is also synthesized by the liver, making it another distractor.
**Clinical Pearl / High-Yield Fact**
The liver's ability to synthesize proteins is essential for maintaining clotting factor levels, which can be compromised in patients with liver disease or cirrhosis. Monitoring clotting factor levels is crucial in these patients to prevent bleeding complications.
**Correct Answer:** A. Insulin.