quiz on intro to metabolism: Fuels and Their Regulation

Which metabolic fuel is always required by the central nervous system?

• Amino acids

• Ketone bodies

• Glucose

• Fatty acids

What is the primary metabolic pathway used by erythrocytes?

• Gluconeogenesis

• Beta-oxidation

• Glycolysis

• Oxidative phosphorylation

In the fed state, what happens to the respiratory quotient?

• It decreases

• It remains constant

• It becomes negative

• It increases

What hormone is responsible for glucose uptake in muscle and adipose tissue?

• Glucagon

• Insulin

• Cortisol

• Epinephrine

What happens to glucose transporters in muscle and adipose tissue in response to insulin?

• They are degraded

• They migrate to the cell surface

• They are internalized

• They become inactive

Which enzyme in the liver is responsible for converting glucose-6-phosphate to glucose?

• Glucokinase

• Hexokinase

• Glycogen phosphorylase

• Glucose-6-phosphatase

What is the primary use of glucose in the liver after a meal?

• Glycogen synthesis

• Lipogenesis

• Energy production

• Protein synthesis

What happens to protein synthesis in the fed state?

• It stops

• It decreases

• It remains constant

• It increases

What is the effect of fasting on plasma glucose levels?

• It decreases and then stabilizes

• It increases significantly

• It remains constant

• It fluctuates wildly

Which hormone increases during fasting to promote glycogen breakdown?

• Insulin

• Cortisol

• Glucagon

• Adrenaline