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Questions and Answers
What are the characteristics of the heart that it shares with skeletal muscle?
What are the characteristics of the heart that it shares with skeletal muscle?
- Branching fibers with similar actin and myosin arrangement (correct)
- Cells connected by gap junctions and desmosomes
- Separated into upper and lower chambers
- Striated appearance and similar contraction mechanism
What is the role of calcium in skeletal muscle excitation/contraction coupling and contraction?
What is the role of calcium in skeletal muscle excitation/contraction coupling and contraction?
- Repolarizes the muscle cell after contraction
- Causes depolarization of the muscle cell
- Prevents the refractory period
- Activates the myosin-actin interaction (correct)
What separates the upper chambers of the heart?
What separates the upper chambers of the heart?
- Interventricular septum
- Interatrial septum (correct)
- Atrioventricular septum
- Pulmonary septum
What is the daily pumping capacity of each side of the heart?
What is the daily pumping capacity of each side of the heart?
What connects the cells of the heart muscle at the intercalated disks?
What connects the cells of the heart muscle at the intercalated disks?
What is the role of intercalated disks in the heart?
What is the role of intercalated disks in the heart?
What is the main similarity between the contraction mechanism of the heart and skeletal muscle?
What is the main similarity between the contraction mechanism of the heart and skeletal muscle?
What separates the upper chambers of the heart?
What separates the upper chambers of the heart?
What is the daily pumping capacity of each side of the heart?
What is the daily pumping capacity of each side of the heart?
What are the characteristics of the heart that it shares with single-unit smooth muscle?
What are the characteristics of the heart that it shares with single-unit smooth muscle?
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