Filamentkontraktion

Filamentkontraktion is a transitional phenomenon that occurs during the cardiac cycle in the human heart. It is characterized by the contraction or shortening of actin and myosin filaments in cardiomyocytes, specifically in the ventricular muscle cells.

During the diastolic phase, the cardiac muscle is in a relaxed state and the contractile units are at rest. As the action potential reaches the Contractile Units, they are exposed to an influx of calcium ions from the sarcoplasmic reticulum via the Release Channels. This triggers a calibrated voltage-dependent channel to open, allowing ions to flood the cell.

The increase in intracellular calcium triggers the interaction between the actin and myosin filaments. The myosin heads bind to the actin filaments, undergoing a power stroke that shortens the actin filaments. This process of filament shortening results in the contraction of the cardiac muscle, which corresponds with the systolic phase of the cardiac cycle.

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Though this term may not exist in general cardiological knowledge, it could provide insights for researchers or medical science students. Then consideration for better source visits can update.