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Questions and Answers
Match the following terms with their definitions related to muscle cell contraction:
Excitation-contraction coupling = Process where electrical signal leads to muscle shortening Neuromuscular junction = Connection between motor neuron and muscle cell Action potential = Electrical signal that triggers muscle contraction Muscle fiber contraction = Mechanical shortening of muscle fibers
Match the phases of action potential with their descriptions in myocardial cells:
Phase 0 = Rapid depolarization phase Phase 1 = Initial repolarization phase Phase 2 = Calcium entry phase Phase 3 = Restoration of resting potential phase
Match the following changes during muscle contraction to their effects:
Muscle fiber becomes shorter = Leads to muscle contraction Muscle fiber becomes more flexible = Facilitates movement Muscle fiber remains unchanged = Indicates no contraction Muscle fiber becomes thicker = Indicates stronger contraction
Match the resting potential values to their corresponding cardiac cells:
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Match the phases of cardiac impulse with their key characteristics:
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Study Notes
Muscle Cell Contraction
- Excitation-contraction coupling (ECC) is the process by which an electrical signal in a muscle cell causes the muscle cell to mechanically shorten.
- ECC consists of two linked phases: excitation phase and contraction phase.
- Neuromuscular junction refers to the connection between a motor neuron and a muscle cell
Changes During Muscle Contraction
- When a muscle fiber contracts, it becomes shorter and flexed.
Myocardial Cells
- The resting potential of normal working myocardial cells is approximately ~90 mV.
Cardiac Impulse
- Phase 0 is central to the rapid propagation of the cardiac impulse.
- Phase 1 sets the potential for the next phase of the action potential.
- Phase 2, the longest phase, marks the phase of calcium entry into the cell.
- Phase 3 restores the membrane potential to its resting value.
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Description
Explore the exciting processes of muscle cell contraction, including excitation-contraction coupling and the role of myocardial cells in the heart. This quiz delves into the phases of the cardiac impulse and how muscle fibers behave during contraction. Test your knowledge on these fundamental physiological concepts!
