WorksheetsChapter 19 Liver Function MEDL 214
Total questions: 60
Worksheet time: 30mins
Which statement best captures the liver’s overall importance as introduced here?
It provides minor support to digestion but is not essential for survival.
It plays an extremely vital role in metabolism, digestion, and elimination of substances, making liver function critical for survival.
It primarily regulates body temperature with limited metabolic involvement.
It mainly produces red blood cells with minimal roles in digestion.
Select all roles attributed to the liver in this introduction.
Metabolism of substances
Digestion processes
Elimination of substances from the body
Primary production of insulin
Match each liver-related concept with its description.
Glycogen
Polymer stored in the liver
Carbohydrate storage
Function that stores carbohydrates in the liver
Regeneration
Unique ability of the mammalian liver
Energy between meals
Purpose served by stored glycogen
Which statement about liver regeneration is accurate according to this introduction?
The liver, along with the kidneys, can regenerate fully in mammals.
The liver is the only organ in mammals that has the ability to regenerate.
Only fetal mammalian livers can regenerate, not adult livers.
Regeneration refers to temporary swelling rather than tissue restoration.
According to the provided description, where is the liver located in relation to the diaphragm and abdominal quadrants?
Upper right quadrant beneath the diaphragm
Upper left quadrant above the diaphragm
Lower right quadrant beneath the diaphragm
Lower left quadrant above the diaphragm
Which statement best characterizes the relative sizes of the liver lobes described?
The right lobe is six times larger than the left and there are two smaller lobes.
The left lobe is twice as large as the right and there are no other lobes.
The right and left lobes are equal in size with one accessory lobe.
The liver has three equal main lobes with no size difference.
Which features are included in the general structural description of the liver in this material? Select all that apply.
Location beneath the diaphragm in the upper right quadrant
Division into two main lobes
Right lobe six times larger than the left
Absence of any smaller lobes
The liver has a dual blood supply. Which vessels provide this supply, and what are their relative contributions to total blood volume?
Portal vein
Originates in the gastrointestinal area; provides ~70% of total blood volume
Hepatic artery
Arises from the aorta; contributes ~30% of total blood volume
Dual supply characteristic
Feature unique to the liver described in this text
Which statement correctly identifies the source and contribution of the portal vein to hepatic blood flow?
From the aorta, contributing 30% of total blood volume
From the gastrointestinal area, providing 70% of total blood volume
From the inferior vena cava, providing 50% of total blood volume
From the pulmonary circulation, providing 20% of total blood volume
Which combination accurately describes the hepatic artery in the liver’s dual blood supply?
Originates in the gastrointestinal tract; supplies 70% of total blood volume
Arises from the aorta; contributes 30% of total blood volume
Arises from the portal system; contributes 50% of total blood volume
Arises from the pulmonary artery; contributes 20% of total blood volume
Based on the text description, which set of statements correctly summarizes the liver’s location and blood supply?
Located beneath the diaphragm in the upper right quadrant
Divided into two main lobes with a markedly larger right lobe
Receives blood solely from the hepatic artery
Receives blood from both the portal vein and hepatic artery
Which vessels together provide the dual blood supply that enters the liver lobule before passing through sinusoids?
Portal vein and hepatic artery
Hepatic vein and inferior vena cava
Bile duct and portal vein
Splenic artery and hepatic vein
Within the liver lobule, what are sinusoids?
Elastic arteries that deliver oxygenated blood to hepatocytes
Lymphatic channels draining interstitial fluid to the portal triad
Capillary channels between rows of hepatic parenchymal cells called hepatocytes
Venous valves regulating flow from the central vein
Select all features that correctly characterize hepatocytes in the lobule context described.
They form rows flanking the sinusoidal capillaries
They are the primary phagocytes that engulf bacteria and debris
They are hepatic parenchymal cells central to liver function
They line the sinusoids as the third, less functionally important hepatic cell
Kupffer cells in liver sinusoids are best described as which of the following?
Endothelial cells that line bile canaliculi
Active phagocytes that engulf bacteria, old RBCs, toxins, and cellular debris from blood
Parenchymal hepatocytes responsible for bile production
Smooth muscle cells regulating sinusoidal constriction
Which statement integrates the pathway and cellular roles within a liver lobule?
Blood from the hepatic vein flows through lymphatic sinusoids to the portal triad, where hepatocytes phagocytose debris
Blood from the portal vein and hepatic artery moves through sinusoidal capillaries between hepatocyte rows to the central vein; Kupffer cells perform phagocytosis
Bile from hepatocytes enters sinusoids en route to the central vein, aided by endothelial cells
Sinusoids are muscular arterioles that pump blood from the central vein to the portal triad
Match each liver function category to the most fitting brief description.
Metabolism
Processing and transforming nutrients
Excretion
Removal of waste products via bile/urine pathways
Detoxification
Chemical modification to neutralize toxins and drugs
Storage
Retention of vitamins, glycogen, and iron for later use
Immunologic
Defense roles including immune surveillance
Which statement best conveys the criticality of the liver’s overall functions as described? Choose one.
The liver performs fewer than 50 nonessential activities.
The liver is responsible for more than 500 separate and critical activities.
The liver mainly aids digestion but has limited systemic roles.
The liver’s activities are redundant and easily replaced by other organs.
A patient with a completely nonfunctional liver would die within approximately how long, based on the description? Choose one.
10 hours
48 hours
7 days
1 month
What is the stated limit of the liver’s regenerative capacity within normal limits? Choose one.
Up to 25% hepatocyte destruction
Up to 50% hepatocyte destruction
Until 75% of hepatocytes have been destroyed
Regeneration stops once any hepatocyte is lost
Which role identifies the liver as the major processor of a specific macronutrient source described? Choose one.
Dietary and endogenous carbohydrates
Dietary proteins only
Exogenous lipids only
Micronutrients exclusively
Which statement about lipoproteins reflects the liver’s role as described? Choose one.
The liver breaks down lipoproteins to release fatty acids.
The liver synthesizes lipoproteins, making insoluble lipids more soluble.
The liver blocks lipoprotein formation to prevent lipid transport.
Lipoproteins are synthesized only in adipose tissue.
Match each liver metabolic output with its primary purpose.
Lipoproteins
Transport and solubilization of lipids
Endogenous cholesterol
Component for cell membranes
Plasma proteins
Maintenance of blood oncotic pressure and carrier functions
Which combination of functions most directly supports the liver’s role in maintaining metabolic homeostasis as described? Select all that apply.
Processing dietary and endogenous carbohydrates
Synthesis of most plasma proteins
Production of endogenous cholesterol
Exclusive excretion of nitrogenous wastes without any synthesis
Which substances are primarily excreted by the liver as part of bile formation and waste removal?
Bile acids, cholesterol, and bilirubin
Glucose, urea, and ketone bodies
Ammonia, lactate, and creatinine
Water, sodium, and potassium
Select all processes that the liver contributes to detoxifying under normal physiology.
Bilirubin generated from heme breakdown
Alcohol consumed in beverages
Most therapeutic drugs, including those that may be hepatotoxic
Inhaled oxygen during respiration
Physicians monitor certain medications with periodic liver function tests primarily because some drugs are:
Particularly hepatotoxic
Ineffective without bile acids
Stored only in skeletal muscle
Excreted solely by the kidneys
Which choice best describes the liver’s role in bilirubin handling?
Detoxifies and excretes bilirubin into bile
Stores bilirubin for future erythropoiesis
Converts bilirubin into hemoglobin directly
Secretes bilirubin as an immunoglobulin
Iron stored in the liver serves which downstream purpose according to the material?
Production of hemoglobin
Generation of bile acids
Neutralization of alcohol
Synthesis of immunoglobulin A
Which list includes only items the liver stores?
Glycogen, iron, copper, and vitamins A, D, E, K
Bilirubin, cholesterol, and alcohol
Urea, creatinine, and ketone bodies
Immunoglobulin A, bile salts, and hemoglobin
Match each stored compound to its classification or example.
Glycogen
Carbohydrate reserve
Fat-soluble vitamins
Includes vitamins A, D, E, and K
Copper
Trace metal stored by the liver
Which liver-resident cells provide immunologic defense by phagocytosis of pathogens and debris?
Kupffer cells
Hepatocytes
Stellate (Ito) cells
Endothelial cells
Which immunologic secretion associated with the liver contributes to mucosal immunity in the biliary tract?
IgA
IgG
IgM
IgE
Approximately what proportion of daily bilirubin production arises from hemoglobin released from aged red blood cells?
About 20%
About 50%
About 80%
About 100%
Where does degradation of red blood cells primarily occur in the context of bilirubin formation?
Reticuloendothelial system
Pancreatic ducts
Muscle tissue
Alveolar macrophages
Which step converts the porphyrin ring into biliverdin during initial bilirubin processing?
Action of biliverdin reductase
Oxidation by heme oxygenase
Conjugation by UDP-glucuronyl transferase
Binding to albumin
Identify the enzyme that reduces biliverdin to indirect (unconjugated) bilirubin.
Heme oxygenase
Biliverdin reductase
Uridyl diphosphate (UDP)-glucuronyl transferase
Ligandin
Which statement best describes the circulation of indirect/unconjugated bilirubin in blood?
It circulates freely without protein binding.
It circulates bound predominantly to albumin (~90%).
It circulates bound to hemoglobin within RBCs.
It is immediately conjugated and water soluble in plasma.
Match each enzyme to its immediate product as described in the instructional text.
Heme oxygenase
Biliverdin
Biliverdin reductase
Indirect/unconjugated bilirubin
UDP-glucuronyl transferase
Bilirubin diglucuronide (conjugated bilirubin)
What is the specific biochemical modification performed by UDP-glucuronyl transferase on bilirubin?
Adds one glucuronic acid
Adds two glucuronic acid molecules
Removes porphyrin ring
Binds bilirubin to albumin
Which term correctly names the water-soluble form of bilirubin produced in the liver after conjugation?
Indirect bilirubin
Unconjugated bilirubin
Bilirubin diglucuronide (conjugated or direct bilirubin)
Biliverdin
Select all accurate properties of conjugated (direct) bilirubin stated in the instructional text.
It is water soluble.
It can cross lipid cell membranes.
It remains bound tightly to albumin in plasma.
It is formed by addition of glucuronic acid via UDP-glucuronyl transferase.
Sequence the early steps of bilirubin formation by selecting the correct ordered pathway.
Heme → Biliverdin (heme oxygenase) → Indirect bilirubin (biliverdin reductase)
Heme → Indirect bilirubin (UDP-glucuronyl transferase) → Biliverdin
Biliverdin → Heme (biliverdin reductase) → Conjugated bilirubin
Indirect bilirubin → Biliverdin (heme oxygenase) → Heme
According to the text, what is the immediate pathway for conjugated bilirubin once formed in the liver?
It is secreted into bile canaliculi for excretion
It circulates freely in the bloodstream
It is reduced to urobilinogen in the stomach
It is stored directly in the pancreas
Which statement best describes gallbladder involvement in bilirubin handling?
It continuously releases bile regardless of digestive signals
It stores bile containing conjugated bilirubin until signals from the digestive tract trigger constriction and expulsion
It converts unconjugated bilirubin to conjugated bilirubin
It filters urobilin from the blood into bile
Which outcome occurs in the duodenum as part of bilirubin metabolism?
Oxidation of bilirubin to urobilin
Reduction of bilirubin to urobilinogen by bacterial action
Conjugation of bilirubin by hepatocytes
Storage of bilirubin within bile canaliculi
Identify the correct sequence for the fate of bilirubin in the intestine, based on the text.
Conjugation → storage in gallbladder → oxidation to urobilinogen → excretion in urine
Reduction to urobilinogen → oxidation to urobilin → excretion in stool
Oxidation to urobilin → reduction to urobilinogen → reabsorption into blood
Storage in pancreas → reduction to urobilinogen → excretion in stool
Which product is responsible for the red-brown color associated with stool excretion in bilirubin metabolism?
Urobilinogen
Conjugated bilirubin
Urobilin
Hemoglobin
Which of the following changes are driven by intestinal bacteria in bilirubin metabolism?
Converting bilirubin to urobilinogen in the duodenum
Oxidizing urobilinogen to urobilin
Triggering gallbladder constriction
Breaking down conjugated bilirubin before excretion into bile canaliculi
According to the Jendrassik–Grof method, what reacts with the diazo reagent to form the colored complex measured in bilirubin assays?
Bile salts
Bilirubin pigments
Gamma-glutamyl transferase
Prothrombin
In the Jendrassik–Grof method, which compound is specifically identified as the diazotized sulfanilic acid component of the diazo reagent?
Sulfanilic acid and sodium nitrite
Sodium benzoate and caffeine
Albumin and sodium chloride
Urea and ammonium sulfate
What is the primary role of caffeine in the Jendrassik–Grof bilirubin assay?
It buffers the solution to maintain pH.
It acts as an accelerator and dissociating reagent to displace bilirubin from albumin.
It precipitates proteins to remove interference.
It serves as the diazo coupling agent.
Which reagent buffers the solution in the Jendrassik–Grof method for bilirubin measurement?
Sodium benzoate
Sodium nitrite
Caffeine
Sulfanilic acid
Match each component of the Jendrassik–Grof bilirubin method with its function.
Diazotized sulfanilic acid (sulfanilic acid + sodium nitrite)
Forms the diazo reagent that couples with bilirubin pigments
Caffeine
Accelerates and dissociates bilirubin from albumin to increase reaction rate
Sodium benzoate
Buffers the solution
Which statement best explains why caffeine is included in the Jendrassik–Grof procedure?
To form the diazo reagent by diazotizing sulfanilic acid
To displace bilirubin from albumin and increase reaction rate
To stabilize the colored azobilirubin product
To reduce sodium nitrite to nitric oxide
Which combination correctly describes the composition of the diazo reagent used in the Jendrassik–Grof bilirubin assay?
Sulfanilic acid with sodium nitrite
Caffeine with sodium benzoate
Albumin with sodium chloride
Urobilinogen with bile salts
In the context of liver function tests, select all parameters that are emphasized in this section as serum markers or analytes related to hepatic assessment.
Bilirubin
Serum enzymes
Serum albumin
Urobilinogen
Which of the following is NOT described as a role of sodium benzoate in the Jendrassik–Grof bilirubin method?
Buffering the solution
Acting as a dissociating reagent for bilirubin–albumin complex
Maintaining reaction conditions
Being distinct from the diazotized sulfanilic acid reagent
Which test parameter related to coagulation is included among key liver function markers in this section?
Erythrocyte sedimentation rate
Prothrombin time
Activated partial thromboplastin time
Bleeding time
Which description best characterizes the interaction between bilirubin pigments and the diazo reagent in the Jendrassik–Grof method?
Bilirubin is precipitated by sodium benzoate to form a pellet.
Bilirubin pigments couple with diazotized sulfanilic acid to form a measurable colored complex.
Caffeine reduces bilirubin to urobilinogen which is then measured.
Serum albumin binds the diazo reagent to amplify signal.
