Cardiac Muscle Structure and Function Quiz

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What is the primary energy source for cardiac muscle?

Anaerobic respiration

Glycolysis

Fermentation

Aerobic respiration (correct)

How does the structural properties of cardiomyocytes differ from skeletal muscle cells?

Cardiomyocytes are multinucleated

Cardiomyocytes lack striations

Skeletal muscle cells have a single nucleus

Skeletal muscle cells have intercalated discs (correct)

Which component of the heart is responsible for the conduction of electrical signals?

T-tubules

Purkinje fibers (correct)

Myofibrils

Sarcoplasmic reticulum

What structural property of cardiomyocytes contributes to the unique function of cardiac muscle?

High mitochondria density Signup and view all the answers

How do the structural properties of cardiomyocytes differ from skeletal muscle cells?

Cardiomyocytes lack T-tubules Signup and view all the answers

Which component of the cardiac conduction system is responsible for initiating the electrical signals in the heart?

Sinoatrial node (SA node) Signup and view all the answers

What is the primary difference between the structural properties of cardiomyocytes and skeletal muscle cells?

Presence of intercalated discs in cardiomyocytes but not in skeletal muscle cells Signup and view all the answers

How does the nearly exclusive reliance on aerobic respiration in cardiac muscle relate to its unique function?

It enables sustained, rhythmic contractions necessary for pumping blood throughout the body Signup and view all the answers

Through which pathway do electrical signals travel in the heart's conduction system?

SA node → AV node → Bundle of His → Purkinje fibers Signup and view all the answers

What is the primary reason for the nearly exclusive reliance on aerobic respiration in cardiac muscle?

Higher efficiency in producing ATP Signup and view all the answers

How do the structural properties of cardiomyocytes contribute to the unique function of cardiac muscle?

Ability to withstand high mechanical stress and pressure Signup and view all the answers

Which component of the cardiac conduction system is responsible for coordinating the contraction of the ventricles?

Purkinje fibers Signup and view all the answers

What structural property of cardiomyocytes allows for their unique function in the heart?

Presence of intercalated discs Signup and view all the answers

Which of the following is a key component of the cardiac conduction system responsible for coordinating the contraction of the atria?

Sinoatrial (SA) node Signup and view all the answers

How does the nearly exclusive reliance on aerobic respiration in cardiac muscle relate to its unique function?

It enables sustained contraction without fatigue Signup and view all the answers

What is the primary factor that contributes to the nearly exclusive reliance on aerobic respiration in cardiac muscle?

Continuous and rhythmic contraction of the heart Signup and view all the answers

In what way do the structural properties of cardiomyocytes differ from those of skeletal muscle cells?

Cardiomyocytes have fewer myofibrils compared to skeletal muscle cells Signup and view all the answers

Which component of the cardiac conduction system is responsible for coordinating the contraction of the ventricles?

Purkinje fibers Signup and view all the answers

How do the structural properties of cardiomyocytes differ from those of skeletal muscle cells?

Cardiomyocytes have a single nucleus while skeletal muscle cells have multiple nuclei. Signup and view all the answers

What is the primary factor contributing to the nearly exclusive reliance on aerobic respiration in cardiac muscle?

The constant and sustained demand for energy by the heart. Signup and view all the answers

Which component of the cardiac conduction system is responsible for initiating the electrical signals in the heart?

SA node Signup and view all the answers

What sets the structural properties of cardiomyocytes apart from those of skeletal muscle cells?

Presence of intercalated discs for electrical coupling Signup and view all the answers

How does the nearly exclusive reliance on aerobic respiration in cardiac muscle relate to its unique function?

Ensures continuous and sustained energy production Signup and view all the answers

Which component of the cardiac conduction system is responsible for coordinating the contraction of the atria?

SA node Signup and view all the answers

What structural property of cardiomyocytes allows for their unique function in the heart?

Presence of intercalated discs Signup and view all the answers

How does the nearly exclusive reliance on aerobic respiration in cardiac muscle relate to its unique function?

It prevents the buildup of lactic acid, maintaining a stable pH in the heart Signup and view all the answers

Which component of the cardiac conduction system is responsible for coordinating the contraction of the ventricles?

Purkinje fibers Signup and view all the answers

What is the primary energy source for cardiac muscle?

Oxidative phosphorylation Signup and view all the answers

How do the structural properties of cardiomyocytes differ from those of skeletal muscle cells?

Multinucleation Signup and view all the answers

Which component of the cardiac conduction system is responsible for coordinating the contraction of the atria?

SA node Signup and view all the answers

Cardiac Muscle Structure and Function Quiz

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Questions and Answers

What is the primary energy source for cardiac muscle?

How does the structural properties of cardiomyocytes differ from skeletal muscle cells?

Which component of the heart is responsible for the conduction of electrical signals?

What structural property of cardiomyocytes contributes to the unique function of cardiac muscle?

How do the structural properties of cardiomyocytes differ from skeletal muscle cells?

Which component of the cardiac conduction system is responsible for initiating the electrical signals in the heart?

What is the primary difference between the structural properties of cardiomyocytes and skeletal muscle cells?

How does the nearly exclusive reliance on aerobic respiration in cardiac muscle relate to its unique function?

Through which pathway do electrical signals travel in the heart's conduction system?

What is the primary reason for the nearly exclusive reliance on aerobic respiration in cardiac muscle?

How do the structural properties of cardiomyocytes contribute to the unique function of cardiac muscle?

Which component of the cardiac conduction system is responsible for coordinating the contraction of the ventricles?

What structural property of cardiomyocytes allows for their unique function in the heart?

Which of the following is a key component of the cardiac conduction system responsible for coordinating the contraction of the atria?

How does the nearly exclusive reliance on aerobic respiration in cardiac muscle relate to its unique function?

What is the primary factor that contributes to the nearly exclusive reliance on aerobic respiration in cardiac muscle?

In what way do the structural properties of cardiomyocytes differ from those of skeletal muscle cells?

Which component of the cardiac conduction system is responsible for coordinating the contraction of the ventricles?

How do the structural properties of cardiomyocytes differ from those of skeletal muscle cells?

What is the primary factor contributing to the nearly exclusive reliance on aerobic respiration in cardiac muscle?

Which component of the cardiac conduction system is responsible for initiating the electrical signals in the heart?

What sets the structural properties of cardiomyocytes apart from those of skeletal muscle cells?

How does the nearly exclusive reliance on aerobic respiration in cardiac muscle relate to its unique function?

Which component of the cardiac conduction system is responsible for coordinating the contraction of the atria?

What structural property of cardiomyocytes allows for their unique function in the heart?

How does the nearly exclusive reliance on aerobic respiration in cardiac muscle relate to its unique function?

Which component of the cardiac conduction system is responsible for coordinating the contraction of the ventricles?

What is the primary energy source for cardiac muscle?

How do the structural properties of cardiomyocytes differ from those of skeletal muscle cells?

Which component of the cardiac conduction system is responsible for coordinating the contraction of the atria?

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