Albumin is synthesized by:
**Core Concept**
Albumin is a major plasma protein produced by the liver, playing a crucial role in maintaining osmotic pressure and binding various substances such as hormones, drugs, and calcium ions.
**Why the Correct Answer is Right**
Albumin synthesis primarily occurs in the liver, where hepatocytes produce the protein through a complex process involving transcription, translation, and post-translational modification. The liver's unique environment, including the presence of specific enzymes and receptors, facilitates the efficient synthesis of albumin. This process is tightly regulated by various factors, including hormones and nutritional status.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as albumin is not primarily synthesized by the kidneys, although it does play a role in the reabsorption of albumin in the renal tubules.
**Option B:** This option is incorrect as albumin is not primarily synthesized by the pancreas, which is involved in the production of digestive enzymes and hormones such as insulin and glucagon.
**Option C:** This option is incorrect as albumin is not primarily synthesized by the spleen, which is involved in filtering the blood and storing red blood cells.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that hypoalbuminemia, characterized by low albumin levels, can lead to edema, ascites, and impaired nutrient and hormone transport.
**Correct Answer: C. Hepatocytes**