IB Nerve impulses

What type of neuron carries a nerve impulse from the brain or spinal cord to an effector such as a muscle?

• Sensory

• Inter

• Relay

• Motor

The myelin sheath surround and insultes which part of a motor neuron?

Which event is true of depolarization?

• Potassium ions diffuse out of the axon

• Sodium ions diffuse into the axon

• The sodium potassium pump exchanges sodium for postassium ions

• The inside of the axon becomes more negative relative to the outside

Identify the resting potential of a motor neuron

• + 40mV

• - 30mV

• + 10 mV

• - 70 mV

Which structure restores and maintains the resting potential?

• Voltage gated sodium channels

• Sodium - potassium pump

• Voltage gated potassium channels

• Nodes of Ranvier

Which structure allows for saltatory conduction?

• Nodes of Ranvier

• Synapses

• Voltage gated ion channels

• Dendrites

Which process is caused by the rapid diffusion of potassium ions into the axon at a specific point?

• Synaptic transmission

• Depolarization

• Repolarization

• Saltatory conduction

The sodium potassium pump uses which type of membrane transport?

• Simple diffusion

• Facilitated diffusion

• Active transport

• Osmosis

Which process is occurs when the potential difference across the axon membrane goes below the resting potential?

• Hyperpolarization

• Deploarization

• Repolarization

• Saltatory conduction

Which process involves the rapid depolarization followed by the rapd repoalarization of the axon membrane?

• Threshold potential

• Action potential

• Resting potential

• Local currents