Cardiac Muscle Metabolism Quiz

What is the primary energy source for cardiac muscle cells?

• Fatty acids and glucose

• Ketone bodies

• Amino acids

• Lactic acid

How does the metabolism of cardiac muscle differ from skeletal muscle?

• Cardiac muscle relies mainly on aerobic metabolism, while skeletal muscle can use both aerobic and anaerobic pathways.

• Skeletal muscle has a higher reliance on fatty acids compared to cardiac muscle.

• Cardiac muscle can only use anaerobic pathways, while skeletal muscle uses aerobic metabolism.

• Cardiac muscle primarily uses anaerobic metabolism, while skeletal muscle relies on aerobic pathways.

What role does oxygen play in cardiac muscle metabolism?

• Oxygen is crucial for aerobic metabolism in cardiac muscle, enabling efficient ATP production.

• Oxygen is a waste product in cardiac muscle metabolism.

• Oxygen is only needed during intense exercise in cardiac muscle.

• Oxygen is primarily used for anaerobic metabolism in cardiac muscle.

Explain the significance of fatty acids in cardiac energy production.

• Fatty acids are primarily used for protein synthesis in the heart.

• Fatty acids are essential for ATP production in the heart, supporting its energy needs.

• Fatty acids have no role in energy production for cardiac cells.

• Fatty acids are only important for muscle contraction, not for the heart.

What is the function of mitochondria in cardiac muscle cells?

• To store genetic material for protein synthesis.

• To facilitate the transport of oxygen in the blood.

• The function of mitochondria in cardiac muscle cells is to produce ATP for energy and regulate calcium levels.

• To produce hormones that regulate heart rate.

How does ischemia affect cardiac muscle metabolism?

• Ischemia enhances aerobic metabolism in cardiac muscle.

• Ischemia impairs aerobic metabolism in cardiac muscle, leading to reliance on less efficient anaerobic pathways.

• Ischemia increases the efficiency of aerobic pathways in cardiac muscle.

• Ischemia has no effect on cardiac muscle metabolism.

What are the byproducts of anaerobic metabolism in cardiac tissue?

• Lactate (lactic acid)

• Acetyl-CoA

• Carbon dioxide

• Pyruvate

Describe the impact of exercise on cardiac muscle metabolism.

• Exercise has no effect on oxygen delivery to the heart.

• Exercise promotes the use of only carbohydrates for energy.

• Exercise enhances cardiac muscle metabolism by, improving oxygen delivery, and promoting efficient substrate utilization.

• Exercise decreases energy demand in cardiac muscle.

What is the role of creatine phosphate in cardiac muscle energy supply?

• Creatine phosphate provides a quick source of energy by regenerating ATP in cardiac muscle.

• Creatine phosphate is a waste product of ATP breakdown.

• Creatine phosphate stores oxygen for aerobic respiration.

• Creatine phosphate is primarily used for muscle contraction.

What adaptations occur in cardiac muscle during prolonged endurance training?

• Increased mitochondrial density and enhanced oxidative capacity.

• Decreased blood flow to the heart muscle.

• Increased reliance on anaerobic metabolism.

• Decreased size of cardiac muscle fibers.