Majority of the afferent blood supply to liver is from
**Core Concept**
The liver receives its blood supply primarily from two sources: the hepatic artery and the portal vein. The hepatic artery supplies oxygenated blood from the aorta, whereas the portal vein carries nutrient-rich, deoxygenated blood from the gastrointestinal tract, spleen, and pancreas. This dual blood supply is crucial for the liver's unique functions, including detoxification, metabolism, and production of bile.
**Why the Correct Answer is Right**
The majority of the afferent blood supply to the liver comes from the portal vein, which carries approximately 75-80% of the liver's blood supply. This is because the liver plays a central role in nutrient metabolism and detoxification, and the portal vein delivers a high volume of nutrient-rich blood from the gastrointestinal tract. The hepatic artery, on the other hand, supplies a smaller volume of oxygenated blood to support the liver's energy needs and maintain tissue oxygenation. The unique arrangement of the hepatic artery and portal vein allows for efficient exchange of oxygen, nutrients, and waste products between the liver and the bloodstream.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not specify the source of the blood supply, making it a vague and incomplete answer.
* **Option B:** This option is incorrect because it implies that the hepatic artery is the primary source of blood supply to the liver, which is not accurate.
* **Option D:** This option is incorrect because it is not a specific or anatomically accurate description of the liver's blood supply.
**Clinical Pearl / High-Yield Fact**
The liver's dual blood supply is essential for its unique functions, and any disruption to this arrangement can lead to liver dysfunction or failure. For example, a decrease in portal flow can lead to liver congestion and fibrosis, while a decrease in hepatic artery flow can lead to liver ischemia and infarction.
**Correct Answer:** C.