Chapter 11 Intro of NS Exam Review

Front

What is the Depolarization phase in a neuron?

Back

The Depolarization phase is the process during which the membrane potential of a neuron becomes more positive, typically reaching around +30 mV, due to the influx of sodium ions.

Front

What channels open first when a neuron is depolarized?

Back

Sodium channels open first during the depolarization of a neuron, allowing sodium ions to flow into the cell.

Front

What are electrical nerve impulses within a neuron called?

Back

Action potentials are the electrical nerve impulses that travel along the neuron.

Front

Why is -55 mV significant in neuronal action potentials?

Back

-55 mV is the threshold potential that must be reached for an action potential to occur.

Front

What is the main control center of the body?

Back

The Central Nervous System (CNS), which includes the brain and spinal cord, is the main control center of the body.

Front

Define action potential.

Back

An action potential is a rapid rise and fall in voltage or membrane potential across a cellular membrane, allowing for the transmission of signals in neurons.

Front

What is resting potential?

Back

Resting potential is the electrical potential of a neuron when it is not actively sending a signal, typically around -70 mV.

Front

What role do potassium channels play during an action potential?

Back

Potassium channels open after depolarization, allowing potassium ions to exit the neuron, which helps to repolarize the membrane.

Front

What is hyperpolarization?

Back

Hyperpolarization is an increase in the membrane potential of a cell, making it more negative than the resting potential.

Front

What is the difference between the central nervous system and the peripheral nervous system?

Back

The Central Nervous System (CNS) consists of the brain and spinal cord, while the Peripheral Nervous System (PNS) includes all the nerves outside the CNS.