HN - Unit 2 Review

Front

What are ligand-gated channels?

Back

Ligand-gated channels are types of ion channels in the cell membrane that open or close in response to the binding of specific chemicals, such as neurotransmitters.

Front

What occurs during repolarization in a neuron?

Back

During repolarization, more potassium ions move outside the neuron, and sodium ions move inside, restoring the negative charge inside the cell.

Front

What is the significance of -55 mV in neuronal action potentials?

Back

-55 mV is the threshold potential required to trigger an action potential in a neuron.

Front

What is the normal resting potential of a neuron?

Back

The normal resting potential of a neuron cell membrane is approximately -70 mV.

Front

What is the difference between depolarization and repolarization?

Back

Depolarization is the process where the membrane potential becomes less negative (more positive), while repolarization is the return to a more negative membrane potential after an action potential.

Front

What is the role of sodium ions during an action potential?

Back

Sodium ions rush into the neuron during depolarization, causing the membrane potential to become more positive.

Front

What is hyperpolarization in neurons?

Back

Hyperpolarization is when the membrane potential becomes more negative than the resting potential, making it less likely to fire an action potential.

Front

What is the function of leaky channels in the cell membrane?

Back

Leaky channels allow ions to passively flow across the membrane, contributing to the resting membrane potential.

Front

What is the difference between voltage-gated and mechanically gated channels?

Back

Voltage-gated channels open or close in response to changes in membrane potential, while mechanically gated channels respond to physical deformation of the membrane.

Front

What is the role of neurotransmitters in synaptic transmission?

Back

Neurotransmitters are chemicals released from neurons that bind to receptors on target cells, facilitating communication between neurons.