Nervous System (BI 231)

Nervous 1

100

Name of support cells in nervous tissue.

neuroglia

200

Part of a neuron where action potentials start

axon hillock

300

In an action potential, which channels open to cause repolarization?

voltage-gated K⁺ channels

400

What term could be used to describe the following change in membrane potential?

-70mV (RMP) to 0mV

depolarization

500

What is the name of the presynaptic cell at the neuromuscular junction?

motor neuron

Nervous 2

100

Name of cells in nervous tissue where action potentials occur

neurons

200

Part of a neuron where graded/local potentials end

axon hillock

300

In an action potential, which channels open to cause hyperpolarization?

voltage-gated K⁺ channels

400

What channel (be specific) opens to cause vesicles containing neurotransmitters to fuse with the cell membrane?

voltage-gated Ca²⁺ channels

500

What is the name of the space through with a NT must diffuse?

synaptic cleft

Nervous 3

100

Type of channel that can initiate an action potential (be specific)

voltage-gated Na⁺ channel

200

What term would be used to describe the following change in membrane potential.  (

-70mV (RMP) to -75mV

hyperpolarization

300

In an action potential, which channels inactivate after opening?

voltage-gated Na⁺ channels

400

What is the name of the neurotransmitter released from motor neurons?

acetylcholine

500

What structure can surround parts of an axon and cause action potentials to be faster?

myelin

Nervous 4

100

Part of a neuron where vesicles containing neurotransmitters can be found

axon terminii (terminals)

200

What is the name of the cell that is an effector at the neuromuscular junction?

skeletal muscle cell (fiber)

300

Where is a higher concentration of Na⁺ found?

outside of the cell

400

What type of neuron would you find if many inputs need to be integrated (e.g., in parts of the brain)?

multipolar neuron

500

What types of channels are important for establishing the resting membrane potential?

leakage channels

Nervous 5

100

Place in a neuron where ligand/chemically-gated ion channels are typically found

dendrites

200

What term could be used to describe the following change in membrane potential?

-70mV (RMP) to -54mV

depolarization

300

Where is a higher concentration of K⁺ found?

inside of the cell

400

What type of channel is the acetylcholine receptor?

Ligand/chemically-gated Na⁺ channel

500

What types of cells myelinate CNS axons?

oligodendrocytes