30 Questions
What is the primary energy source for cardiac muscle?
Aerobic respiration
How does the structural properties of cardiomyocytes differ from skeletal muscle cells?
Skeletal muscle cells have intercalated discs
Which component of the heart is responsible for the conduction of electrical signals?
Purkinje fibers
What structural property of cardiomyocytes contributes to the unique function of cardiac muscle?
High mitochondria density
How do the structural properties of cardiomyocytes differ from skeletal muscle cells?
Cardiomyocytes lack T-tubules
Which component of the cardiac conduction system is responsible for initiating the electrical signals in the heart?
Sinoatrial node (SA node)
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
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
Through which pathway do electrical signals travel in the heart's conduction system?
SA node → AV node → Bundle of His → Purkinje fibers
What is the primary reason for the nearly exclusive reliance on aerobic respiration in cardiac muscle?
Higher efficiency in producing ATP
How do the structural properties of cardiomyocytes contribute to the unique function of cardiac muscle?
Ability to withstand high mechanical stress and pressure
Which component of the cardiac conduction system is responsible for coordinating the contraction of the ventricles?
Purkinje fibers
What structural property of cardiomyocytes allows for their unique function in the heart?
Presence of intercalated discs
Which of the following is a key component of the cardiac conduction system responsible for coordinating the contraction of the atria?
Sinoatrial (SA) node
How does the nearly exclusive reliance on aerobic respiration in cardiac muscle relate to its unique function?
It enables sustained contraction without fatigue
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
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
Which component of the cardiac conduction system is responsible for coordinating the contraction of the ventricles?
Purkinje fibers
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.
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.
Which component of the cardiac conduction system is responsible for initiating the electrical signals in the heart?
SA node
What sets the structural properties of cardiomyocytes apart from those of skeletal muscle cells?
Presence of intercalated discs for electrical coupling
How does the nearly exclusive reliance on aerobic respiration in cardiac muscle relate to its unique function?
Ensures continuous and sustained energy production
Which component of the cardiac conduction system is responsible for coordinating the contraction of the atria?
SA node
What structural property of cardiomyocytes allows for their unique function in the heart?
Presence of intercalated discs
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
Which component of the cardiac conduction system is responsible for coordinating the contraction of the ventricles?
Purkinje fibers
What is the primary energy source for cardiac muscle?
Oxidative phosphorylation
How do the structural properties of cardiomyocytes differ from those of skeletal muscle cells?
Multinucleation
Which component of the cardiac conduction system is responsible for coordinating the contraction of the atria?
SA node
Test your knowledge of the structural properties of cardiomyocytes, their differences from skeletal muscle, and their relation to the unique function of cardiac muscle. Explore the components of the cardiac conduction system and the pathway of electrical signals through the heart.
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