A2 Biology nervous system

Front

A nerve is

Back

a bundle of neurones

Front

This diagram shows a (Options: sensory neurone, motor neurone, relay neurone, association neurone)

Back

sensory neurone

Front

The myelin sheath around an axon is made

Back

from Schwann cells

Front

In a motor neurone there is

Back

an axon but no dendron

Front

When the neurone is not conducting a nerve impulse, the membrane is

Back

polarised

Front

When an action potential is generated, the inside of the membrane becomes

Back

positive relative to the outside

Front

Threshold stimulus means that

Back

a certain level of stimulus is required to generate an action potential

Front

The time following an action potential in which no new action potential can be generated is called

Back

the refractory period

Front

The speed of nerve transmission is greatest when there is: a myelin sheath, saltatory conduction, thick axon.

Back

All options are correct.

Front

A motor neurone is used to

Back

connect the spinal cord to the thigh muscle