12.6 Plasma membrane of neurons

Question 1

What are the three types channels?

Answer 1

1) Leaky channels- always open Na+ and K+ channels
2) Chemically gated channels- open with neurotransmitter- K+ and Cl-
3) Voltage-gated channels- open in response to electrical charge (potential) across a plasma membrane. Na+, K+, Ca+

Question 2

What are the three states of voltage gated Na+ channels?

Answer 2

1) Resting state- inactivation gate open, activation gate closed
2) Activation stated- inactivation and activation gate open- activation opens in response to potential
3) Inactivation state- inactivation gate temporarily closed, but activation gate open.

Question 3

Modality channels

Answer 3

Componentes of sensory neurons that open or close in response to stimulus.

Question 4

What channels are located throughout the neuron?

Answer 4

Na+/K+ pump, and leaky Na+ and K+ channels

Question 5

What channels are located in dendrites and cell body?

Answer 5

Chemically gated cation, K+ and Cl- channels.

Question 6

What channels are located in the axon hillock and the axon?

Answer 6

Voltage gated Na+ and K+ channels.

Question 7

What type of channels are located near the synaptic bulb?

Answer 7

Voltage gated Ca+ channels and Ca+ pump