$$\text{Glucose} \xrightarrow{glycogenesis} \text{Glycogen}$$

$$\text{Amino acid} + \text{H}_2\text{O} \xrightarrow{deamination} \text{Keto acid} + \text{NH}_3$$

Question 1

Which organ is primarily responsible for converting excess acetyl-CoA into ketone bodies during periods of fasting or carbohydrate restriction?

Accepted Answer

Liver

Question 2

What is the main function of HDL (high-density lipoprotein) in cholesterol transport?

Accepted Answer

Returns excess cholesterol from peripheral tissues to the liver

Question 3

Which process describes the liver's ability to produce glucose from non-carbohydrate sources, such as amino acids?

Accepted Answer

Gluconeogenesis

Question 4

A patient with chronic alcoholism is at risk for liver failure partly because the liver is responsible for metabolizing which substance?

Accepted Answer

Alcohol (ethanol)

Question 5

Which vitamin can the liver synthesize after exposure to sunlight, and what is the process called?

Accepted Answer

Vitamin D; conversion of cholesterol to cholecalciferol

Question 6

If a person consumes more protein than needed, which organ is responsible for deaminating the excess amino acids?

Accepted Answer

Liver

Question 7

Which of the following best describes the role of VLDL (very low-density lipoprotein)?

Accepted Answer

Transports triglycerides from the liver to adipose tissue and muscle

Question 8

During intense exercise, which metabolic pathway is most responsible for providing rapid energy from stored glycogen?

Accepted Answer

Glycogenolysis

Question 9

Which equation correctly represents the conversion of excess glucose to glycogen in the liver?

Accepted Answer

$$	ext{Glucose} \xrightarrow{glycogenesis} 	ext{Glycogen}$$

Question 10

Which of the following statements about cholesterol is TRUE?

Accepted Answer

Cholesterol is used to make steroid hormones and vitamin D.

Question 11

A patient has a high LDL/HDL ratio. What does this indicate about their cholesterol transport?

Accepted Answer

They have more cholesterol being deposited in peripheral tissues, increasing risk for plaque buildup.

Question 12

Which process allows the liver to convert ammonia, a toxic byproduct of amino acid metabolism, into a less toxic compound for excretion?

Accepted Answer

Urea cycle

Question 13

Which of the following is a function of the liver in lipid metabolism?

Accepted Answer

Synthesizing triglycerides from excess carbohydrates

Question 14

Which equation represents the deamination of an amino acid, as performed by the liver?

Accepted Answer

$$	ext{Amino acid} + 	ext{H}_2	ext{O} \xrightarrow{deamination} 	ext{Keto acid} + 	ext{NH}_3$$

Question 15

Why is the liver considered the 'metabolic organ' of the body?

Accepted Answer

It regulates and processes nutrients, detoxifies substances, and synthesizes key molecules.

Question 16

Which of the following best explains why the liver is able to regulate blood cholesterol levels?

Accepted Answer

It synthesizes, packages, and excretes cholesterol via bile.

Question 17

A person is fasting and their body needs to maintain blood glucose levels. Which process in the liver is most important?

Accepted Answer

Gluconeogenesis

Question 18

Which equation represents the synthesis of urea from ammonia in the liver?

Accepted Answer

$$2	ext{NH}_3 + 	ext{CO}_2 \xrightarrow{urea\ cycle} 	ext{urea} + 	ext{H}_2	ext{O}$$

Question 19

Which of the following is NOT a function of the liver?

Accepted Answer

Production of insulin

Question 20

Which statement best describes the role of lipoproteins in the body?

Accepted Answer

They are protein complexes that transport water-insoluble lipids in the blood.

Liver Function and Lipid Metabolism: Study Notes for Anatomy & Physiology

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