2.1.3 - 2.1.8 Test Reveiw

Front

What is the distribution of Na+ and K+ ions in a resting neuron cell membrane?

Back

There is more Na+ on the outside of the cell membrane and more K+ on the inside of the cell membrane.

Front

What happens to the membrane potential during the depolarization phase of an action potential?

Back

The inside of the membrane is becoming more positive with respect to the outside.

Front

What is the primary activity during the depolarization phase of an action potential?

Back

Sodium ions are flowing into the cell.

Front

What is the difference between a reflex and a reaction?

Back

A reaction is a voluntary response that involves processing in the brain, while a reflex is an involuntary response.

Front

What is the correct order of structures in a simple reflex arc that carry a nerve impulse?

Back

Sensory neuron, spinal cord, motor neuron, effector.

Front

Define resting membrane potential.

Back

The resting membrane potential is the electrical potential difference across the membrane of a resting neuron, typically around -70mV.

Front

What role do sodium ions play in action potentials?

Back

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

Front

What is the role of potassium ions during repolarization?

Back

Potassium ions flow out of the neuron, helping to restore the resting membrane potential.

Front

What is an action potential?

Back

An action potential is a rapid change in membrane potential that occurs when a neuron sends information down an axon.

Front

What is the significance of the threshold potential?

Back

The threshold potential is the critical level to which a membrane must be depolarized to initiate an action potential.