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Medical Physiology
The Physiology of the Liver
80
Health Care
Graduate
07/21/2007

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Term
The liver is the _______ organ in the body, constituting about _______ of an adult's body weight.
Definition
Largest; 2.5%
Term
The liver receives _______ of the cardiac output viat the _______ and _______.
Definition
25%; Hepatic Portal Vein; Hepatic Artery
Term
The liver plays an important role in _______.
Definition
Maintaining blood glucose levels
Term
The liver also regulates the circulating blood lipids by the amount of _______ it secretes.
Definition
Very Low Density Lipoproteins (VLDLs)
Term
The liver takes up numerous _______ and _______ from the portal circulation.
Definition
Toxic substances; Drugs
Term
The bile canaliculus is usually lined by _______ and is separated from the pericellular space by _______.
Definition
Two hepatocytes; Tight Junctions
Term
The tight junctions prevent the mixin gof contents between the ________ and the _______.
Definition
Bile canaliculus; Pericellular space
Term
The arrangement of hepatocytes along liver sinusoids Aids the _______ of molecules.
Definition
Rapid exchange
Term
The Perisinusoidal space is also known as the _______, and is separated from the sinusoid by a layer of _______.
Definition
Space of Disse; Sinusoidal endothelial cells
Term
Endothelial cells of the liver lack _______.
Definition
A basement membrane
Term
Liver endothelial cells have _______ plates that permit the ready exchange of materials between the perisinusoidal space and the sinusoid.
Definition
Sieve-like
Term
_______ line hepatic sinusoids, these are resident _______ of the fixed ________ system that play an extremely important role in removing unwanted material.
Definition
Kupffer Cells; Macrophages; Monocyte-macrophage
Term
Some perisinusoidal cells contain distinct _______ in the cytoplasm.
Definition
Lipid droplets
Term
The fat-storage cell are called _______ or _______ cells.
Definition
Stellate; Ito
Term
The liver receives venous blood through _______ and arterial blood through _______.
Definition
The Portal Vein; The Hepatic Artery
Term
The lipid droplets inthe stellate or Ito cells contain _______.
Definition
Vitamin A
Term
The _______ provides about 70 to 80% of the liver's blood supply, and the _______ provides the rest.
Definition
Hepatic portal vein; Hepatic artery
Term
Increased resistance to portal blood flow results in _______.
Definition
Portal Hypertension
Term
Portal Hypertension is the most common complication of _______, and accounts for a large percentage of the morbidity and mortality associated with _______.
Definition
Chronic liver disease; Chronic liver diseases
Term
The hepatic lymphatic system is present in three main areas: _______ to the central veins; _______ to the portal veins and coursing along the hepatic artery.
Definition
Adjacent; Adjacent
Term
Disturbances in the balance of filtration and drainage in the liver lymphatic system are the primary causes of _______.
Definition
Ascites
Term
Of the solid organs the liver is the only one that can _______.
Definition
Regenerate
Term
There appears to be a critical ration between _______ and _______.
Definition
Functioning liver mass; body mass
Term
_______ is a common manifestation of portal hypertension.
Definition
Esophageal Varices
Term
Hepatocytes play an extremely important role in the _______ and _______, compounds that are foreign to the body and some of which are toxic.
Definition
Metabolism of drugs; Xenobiotics
Term
The enzyme systems in phase I and phase II are _______.
Definition
Age-dependent
Term
The liver is pivotal in regulating the metabolism of _______, _______, and _______.
Definition
Carbohydrates; Lipids; Proteins
Term
Most water-soluble nutrients and vitamins absorbed from the _______ are transported via the _______ to the liver.
Definition
Small Intestine; Portal blood
Term
The nutrients transported in portal blood include _______, _______, and _______.
Definition
Amino Acids; Monosaccharides; Fatty acids
Term
The liver is important in _______ metabolism.
Definition
Carbohydrate
Term
The liver is extremely important in maintaining an adequate supply of nutrients for _______ and regulating _______.
Definition
Cell metabolism; Blood glucose concentration
Term
UDP-glucose can be used fro glycogen synthesis or ______.
Definition
Glycogenesis
Term
_______ is the main carbohydrate store in the liver, and may amount to as much as 7 to 10% of the weight of a normal healthy liver.
Definition
Glycogen
Term
During fasting glycogen is broken down by _______.
Definition
Glycogenolysis
Term
Both Glycogenolysis and glycogenesis are _______.
Definition
Hormonally regulated
Term
Insulin tends to _______ blood glucose by stimulating _______ and suppressing _______ and _______.
Definition
Lower;glycogenesis;Glycogenolysis; Gluconeogenesis
Term
Galactose is an important sugar used not only to provide energy but also to in the biosynthesis of _______ and _______.
Definition
Glycoproteins; Glycolipids
Term
_______ is the production of glucose from non-carbohydrate sources such as fat, amino acids, and lactate.
Definition
Gluconeogenesis
Term
Gluconeogenesis is energy _______ and the starting substrate is _______.
Definition
Dependent; Pyruvate
Term
Gluconeogenesis is important in maintaining blood blucose concentrations especially during _______.
Definition
Fasting
Term
The liver plays a pivotal role in _______.
Definition
Lipid Metabolism
Term
The liver takes up _______ and _______ from the plasma.
Definition
Free fatty acids; Lipoproteins
Term
During fasting, fatty acids are mobilized from _______ and taken up by the liver.
Definition
Adipose tissue
Term
The four majour classes of circulating plasma lipoproteins are _______, _______, _______ and _______.
Definition
Chylomicrons; VLDLs; LDLs; HDLs
Term
_______ are the lightest of the four lipoprotein classes, anre are made only by the small intestine.
Definition
Chylomicrons
Term
Chylomicrons are produced in large quantities during _______.
Definition
Fat ingestion
Term
The liver synthesizes about 10 times more _______ than the small intesine.
Definition
Circulating VLDLs
Term
VLDLs are associated with an important class of proteins the _______.
Definition
Apo B proteins
Term
In _______, apo B synthesis and therefore the secretio nof VLDLs is blocked, and therefore the secretion of VLDLs is blocked
Definition
Abetalipoproteinemia
Term
Large lipid droplets can be seen in the cytoplasm of hepatocytes in _______.
Definition
Abetalipoproteinemia
Term
The importance of the liver in lipoprotein metabolism is exemplified by _______, a disorder in which the liver fails to produce the LDL receptor.
Definition
Familial Hypercholesterolemia
Term
The level of ketone bodies circulating in the blood is usually _______, but during prolonged starvation and in diabetes mellitus it is _______, a condition known as _______.
Definition
Low; Highly elevated; Ketosis
Term
Most organs _______ the liver can use ketone bodies as fuel.
Definition
Except
Term
The two ketone bodies are _______ and _______.
Definition
Acetoacetate; Beta-hydroxybutyrate
Term
The liver plays an important role in cholesterol _______.
Definition
Homeostasis
Term
The liver is one of the majour organs involved in synthesizing _______ from the essential amino acids.
Definition
Non-essential amino acids
Term
The liver synthesizes many of the circulating plasma proteins, _______ being the most important.
Definition
Albumin
Term
Albumin plays an important role in _______ and tissue fluid balance by maintaining _______ of plasma.
Definition
Preserving plasma volume; Colloid Osmotic Pressure
Term
The liver has an _______ 10 times higher than the plasma _______ level.
Definition
Ammonia level; Ammonia
Term
The liver synthesizes most of the _______ in the body.
Definition
Urea
Term
The _______ amino acids must be supplied in the diet.
Definition
Essential
Term
_______ and _______ play an important role in the biosynthesis of certain amino acids in the liver.
Definition
Glutamic acid; Glutamine
Term
Glutamine plays an important role in the _______ and _______ of ammonia in the blood.
Definition
Storage; Transport
Term
Another important role of th eliver the _______ and _______ of fat-soluble vitamins and iron.
Definition
Storage; Metabolism
Term
Most of the known clotting-factors and _______ are secreted by hepatocytes, some of the exclusively.
Definition
Inhibitors
Term
The vitamin K dependent clotting factors are _______, _______, _______ and _______ and _______.
Definition
II; VII; IX; X; Proteins C and S
Term
The monocyte-macrophage system of the liver, predominantly _______, is an important system for clearing _______ and factor-inhibitor complexes.
Definition
Kupffer Cells; Clotting Factors
Term
The liver plays a pivotal role in the uptake, storage and maintenance of circulating plasma _______ levels.
Definition
Vitamin A
Term
When plasma Vitamin A levels fall, the liver mobilzes the vitamin A store by hydrolyzing the _______.
Definition
Retinyl ester
Term
The liver is responsible for the _______ of vitamin D.
Definition
Initial activation
Term
The circulating plasma transferrin levels is _______ proportional to the _______ of the body.
Definition
Inversely; Iron Load
Term
The _______ the concentration of Ferritin in the hepatocyte, the _______ the rate of transferrin synthesis.
Definition
Higher; Lower or vice-versa
Term
_______ binds free hemoglobin in the blood, and the _______ is reapidly removed by the liver conserving iron in the body.
Definition
Haptoglobin; Haptoglobin-Hemoglobin complex
Term
_______ is another protein synthesized by the liver that is involved in the transport of free HEME in the blood.
Definition
Hemopexin
Term
Recent studies suggest that _______ are the majour sites of long-term iron storage.
Definition
Hepatocytes
Term
The liver is also a majour site of conversion of the _______ hormone _______ to the biologically active more potent hormone _______.
Definition
Thyroid; Thyroxine (T4); Triiodothyronine (T3)
Term
The liver modifies the function of _______ secreted by the pituitary gland.
Definition
Growth Hormone (GH)
Term
The liver helps to _______ and _______ many circulating hormones.
Definition
Remove; Degrade
Term
Insulin is degraded in many organs, but the _______ and _______ are by far most important.
Definition
Liver; Kidneys
Term
Glucagon and growth hormone are degraded mainly by _______ and _______.
Definition
The liver; The kidneys
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