THE LIVER
The Liver: The Body's Metabolic Powerhouse and Master Chemist
I'm
The liver is the largest solid organ and the largest gland in the human body, weighing approximately 1.4
kg (3 lbs) in an average adult.
Far from being a single-function organ, it is a central hub for metabolism, detoxification, synthesis, and
storage—a true biochemical factory that performs over 500 known functions.
1. Anatomy & Location
· Position
It resides in the upper right quadrant of the abdominal cavity, just beneath the diaphragm, and is
protected by the rib cage.
· Lobes:
Anatomically divided into a large right lobe and a smaller left lobe, with two minor lobes (caudate and
quadratic) on the posterior side.
, · Functional Units:
From a microscopic and functional perspective, the liver is organized into lobules.
These are hexagonal structures centered around a central vein, with hepatocytes (liver cells) arranged in
radiating plates.
At the corners of each lobule are portal triads (a branch of the hepatic artery, hepatic portal vein, and
bile duct).
· Dual Blood Supply (Unique Feature):
1. Hepatic Artery: Brings oxygen-rich blood from the heart (25-30% of supply).
2. Hepatic Portal Vein:
Brings nutrient-rich, but toxin-laden, blood from the digestive tract (stomach, intestines, spleen,
pancreas) for processing (70-75% of supply).
This dual supply underscores the liver's role as a processing plant for absorbed materials.
2. Cellular Architecture
a· Hepatocytes:
The Liver: The Body's Metabolic Powerhouse and Master Chemist
I'm
The liver is the largest solid organ and the largest gland in the human body, weighing approximately 1.4
kg (3 lbs) in an average adult.
Far from being a single-function organ, it is a central hub for metabolism, detoxification, synthesis, and
storage—a true biochemical factory that performs over 500 known functions.
1. Anatomy & Location
· Position
It resides in the upper right quadrant of the abdominal cavity, just beneath the diaphragm, and is
protected by the rib cage.
· Lobes:
Anatomically divided into a large right lobe and a smaller left lobe, with two minor lobes (caudate and
quadratic) on the posterior side.
, · Functional Units:
From a microscopic and functional perspective, the liver is organized into lobules.
These are hexagonal structures centered around a central vein, with hepatocytes (liver cells) arranged in
radiating plates.
At the corners of each lobule are portal triads (a branch of the hepatic artery, hepatic portal vein, and
bile duct).
· Dual Blood Supply (Unique Feature):
1. Hepatic Artery: Brings oxygen-rich blood from the heart (25-30% of supply).
2. Hepatic Portal Vein:
Brings nutrient-rich, but toxin-laden, blood from the digestive tract (stomach, intestines, spleen,
pancreas) for processing (70-75% of supply).
This dual supply underscores the liver's role as a processing plant for absorbed materials.
2. Cellular Architecture
a· Hepatocytes:
