Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
A depolarization is a change in membrane potential that makes the potential less negative.

Verified step by step guidance

1. Understand the concept of depolarization: Depolarization refers to a change in the membrane potential of a cell, typically a neuron or muscle cell, where the inside of the cell becomes less negative compared to the resting membrane potential.
2. Recall the resting membrane potential: The resting membrane potential is usually around -70 mV in neurons, meaning the inside of the cell is more negative relative to the outside.
3. Analyze the statement: A depolarization occurs when the membrane potential becomes less negative (e.g., moving from -70 mV to -60 mV or even positive values). This is caused by the influx of positively charged ions, such as sodium (Na⁺), into the cell.
4. Determine if the statement is true or false: Based on the definition of depolarization, the statement 'A depolarization is a change in membrane potential that makes the potential less negative' is true.
5. If the statement were false, correct it: If the statement had been false, you would need to clarify that depolarization specifically refers to the membrane potential becoming less negative, not more negative (which would be hyperpolarization).

Key Concepts

Depolarization

Depolarization refers to a change in the membrane potential of a cell, where the inside of the cell becomes less negative compared to the outside. This occurs when sodium ions (Na+) flow into the cell, reducing the voltage difference across the membrane. It is a critical process in the generation of action potentials in neurons and muscle cells.

Membrane Potential

Membrane potential is the electrical potential difference across a cell's plasma membrane, resulting from the distribution of ions inside and outside the cell. It is typically measured in millivolts (mV) and can vary based on ion permeability and concentration gradients. A resting membrane potential is usually negative, indicating that the inside of the cell is more negative than the outside.

Action Potential

An action potential is a rapid, temporary change in membrane potential that occurs when a neuron or muscle cell is stimulated. It involves a sequence of depolarization followed by repolarization, allowing for the transmission of electrical signals along neurons and the contraction of muscle fibers. Understanding action potentials is essential for grasping how signals are propagated in the nervous system.