Mod 3 Lecture 2: Conditions Effecting the Gastrointestinal System and Pharmacotherapy Flashcards
Exam 2 (213 cards)
Location of the Liver
Upper right quadrant (URQ) of the abdomen, under the diaphragm
What is the structure of the liver?
Large fibrous capsule divided by falciform ligament into right and left lobes
Where are the liver ducts located and what do they do?
Has right and left hepatic ducts and a common hepatic duct; drains bile
What are the functional units of the liver?
Hepatocytes
Hepatocytes
liver cells; arranged in lobules, can regenerate, up to a point
What is involved in the liver’s blood supply?
Hepatic artery
Hepatic Portal vein
Hepatic vein
Hepatic artery
brings oxygenated blood from general circulation to liver
How much blood does the hepatic artery bring to the liver?
400-500ml/min
Hepatic artery supplies how much blood to the liver?
Supplies 25% of blood, dependent on cardiac output
Hepatic portal vein does what?
Receives deoxygenated blood from stomach, pancreas, spleen, small & large intestines to the liver
How much blood does the hepatic portal vein deliver to the liver?
1,000-1500 mL/min
The hepatic portal vein carries what else to the liver?
The hepatic portal vein, which carries 75% of the blood to the liver, is rich in nutrients that have been absorbed from the intestinal tract
Hepatic vein
Empties into the inferior cava
Bile is made up of what?
Bile is an alkaline, bitter-tasting, yellowish green fluid that contains bile salts (conjugated bile acids), cholesterol, bilirubin (a pigment), electrolytes, and water.
What do electrolytes in the bile do?
Electrolytes ~ HCO3
Neutralizes acidic gastric contents
Promotes actions of intestinal & pancreatic enzymes
What is bile produced from?
Produced by hepatocytes
How much bile is secreted by the liver a day?
700-1200 ml/day
How does bile exit the liver?
Exits from liver via hepatic duct system
Where is bile stored?
Gallbladder ~ storage
Bile drains from _____to ______
Common Bile Duct to Duodenum
What is bile salts/acids made from?
Formed from cholesterol
What does bile do to fats
Emulsification of fats and facilitates absorption via small intestine of fat-soluble vitamins ~ A, D, E, K for digestion
What are the fat soluble vitamins?
A, D, E, K for digestion
What lipid-lowering agents did we discuss last semester that decreases cholesterol absorption in the small intestine and block bile from being reabsorbed so more passes out of stool?
Cholesterol absorption inhibitors - Ezetimibe (zetia)
Bile-Acid Sequestrants (colesevelam)
Flaxseed