HB - Unit 2 Part 2 + 3 Review

Front

What are voltage-gated channels?

Back

Voltage-gated channels are ion channels that open or close in response to changes in membrane potential, allowing ions to flow across the membrane.

Front

What are ligand-gated channels?

Back

Ligand-gated channels are ion channels that open when a specific molecule (ligand) binds to a receptor on the channel, allowing ions to flow across the membrane.

Front

What is the resting charge inside a neuron?

Back

The inside of a neuron has a negative charge at resting potential.

Front

What is membrane potential?

Back

Membrane potential is the difference in ion concentration (chemical composition) inside and outside the cell, affecting the cell's electrical charge.

Front

What ion is more concentrated inside a neuron at resting potential?

Back

Potassium ions (K+) are more concentrated inside the neuron at resting potential.

Front

What type of neurons send signals from the brain to muscles?

Back

Motor neurons send signals from the brain to muscles.

Front

What is the role of sensory neurons?

Back

Sensory neurons transmit sensory information from the body to the central nervous system.

Front

What is an action potential?

Back

An action potential is a rapid change in membrane potential that occurs when a neuron sends a signal along its axon.

Front

What is the difference between action potential and resting potential?

Back

Action potential is a temporary reversal of membrane potential, while resting potential is the stable, negative charge of a neuron at rest.

Front

What happens during depolarization?

Back

During depolarization, the membrane potential becomes less negative (more positive) due to the influx of sodium ions (Na+).