Contact of a sea urchin egg with signal molecules on sperm causes the egg to undergo a brief membrane depolarization.
What is membrane Polarization?
- In biology, depolarization or hyperpolarization refers to a change in a cell's electric charge distribution that causes the cell to have less negative charge inside it than outside .
- Numerous cell functions, cell-cell communication, and the general physiology of an organism all depend on depolarization.
- In higher organisms, the majority of cells maintain a negatively charged internal environment in relation to their external environment.
- The cell's membrane potential is referred to as this differential in charge.
- The negative internal charge of the cell briefly becomes more positive during depolarization (less negative).
- Several activities, including an action potential, result in this membrane potential transition from a negative to a more positive state.
- The depolarization that occurs during an action potential is so great that the potential difference across the cell membrane momentarily changes polarity, making the interior of the cell positively charged.
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