BIOL-1240 Nervous System Ch 35

The inner surface of a resting neuron is _____________ compared with the outside.

• positively charged

• negatively charged

• polarized

• 70 mV

• -70 mV

The part of the neuron that transmits an impulse from the cell body to an effector cell is the

• dendrite

• axon

• Schwann body

• collateral

• hillock

Saltatory conduction

• occurs only in the CNS

• is more rapid than the continuous type

• requires less energy than continuous conduction

• involves depolarization at nodes of Ranvier

The nodes of Ranvier are

• on the cell body

• on the dendrites

• on the axon

• gaps between adjacent Schwann cells

• insulated with myelin

A neuron that begins at a synapse is called

• presynaptic neuron

• postsynaptic neuron

• synapsing neuron

• neurotransmitter

• acetylcholine releaser

Which of the following correctly expresses the movement of ions by the sodium-potassium pump?

• sodium out, potassium in

• sodium in, potassium out

• sodium and potassium both in and out, but in different amounts

• more sodium out than potassium in

• less sodium out than potassium in

A nerve pathway or tract in the CNS is

• one neuron

• a group of nerves

• a bundle of axons

• a ganglion

• a bundle of cell bodies

An axon cannot transmit an action potential no matter how great a stimulus is applied when it is

• hyperpolarized

• depolarized

• in the absolute refractory period

• in the relative refractory period

• in the resting state

If a neurotransmitter hyperpolarizes a postsynaptic membrane, the change potential is referred to as

• spatial summation

• temporal summation

• a threshold level impulse

• IPSP

• EPSP

Branchlike extensions of the cell body involved in receiving stimuli are

• dendrites

• axons

• Schwann bodies

• collaterals

• hillocks