Nerve Communucation

Question 1

Action potentials are _____ distance communication

Answer 1

Long

Question 2

What is the normal resting potential in mV?

Answer 2

-70 mV

Question 3

3 Na ions go out for every…

Answer 3

2K ions that come into the cell

Question 4

What is the electrochemical gradient?

Answer 4

The main path for current to flow across a membrane

Question 5

Graded potentials are ______ distance communication

Answer 5

Short

Question 6

Graded potentials are either more or less_______

Answer 6

Polarized

Question 7

Where do most graded potentials occur?

Answer 7

The soma and dendrites

Question 8

What does graded mean?

Answer 8

Amplitude of electrical signal varies

Question 9

What do amplitude of electrical signals vary on?

Answer 9

Strength of stimulus

Number of ligand gated or mechanical geted channels open

Question 10

What do action potentials propagate along?

Answer 10

Axons

Question 11

What are action potentials only in?

Answer 11

Excitable membranes (neuron and muscle cells)

Question 12

Action potentials don’t_______ with distance

Answer 12

Decrease

Question 13

What is the resting state of an axon potential?

Answer 13

Voltage gated ion channels open

Question 14

What is depolarization?

Answer 14

The membrane potential becomes less negative reaching zero

Question 15

What must the action potential reach to get to depolarization?

Answer 15

Threshold(-55mV)

Question 16

What is repolarization?

Answer 16

Sodium channels close and potassium channels open

Membrane potential is restored to its resting state

Question 17

What is hyperpolarization?

Answer 17

Some potassium channels open and sodium channels reset

Question 18

What factors affect the speed of an action potential?

Answer 18

The amount of Myelination
Axon diameter
Temperature

Question 19

What are the two types of synapses?

Answer 19

Electrical and chemical

Question 20

What is a synapse?

Answer 20

Junction between neurons the action potentials travel through

Question 21

What does the presynaptic neuron do?

Answer 21

Sends a signal

Question 22

What does the postsynaptic neuron do?

Answer 22

Receives the signal

Question 23

Is an electrical synapse passive or active transport?

Answer 23

Passive

Question 24

What direction does the current flow in an electrical synapse?

Answer 24

In both directions

Question 25

What do chemical synapses do?

Answer 25

Convert electrical signals (action potential) to chemical signals ( neurotransmitter)