Test 1.2 Flashcards
Why is Cl- important
It’s important in the way a cell responds to chemical neurotransmitter
Explain passive response
When you change voltage by pumping membrane
When at rest what does a negative potential produce?
Hyper-polarizing currents or small depolarizing currents to produce a passive response
At rest what does a resting membrane potential produce
Larger depolarizing currents
What is the resting potential around
-65 mil volts
What do action potential peak at?
+40 mil volts
How are neurons designed to produce electrical signal and what does it create
By crating a battery out of every neuron the cell membrane separates the two compartments of the battery and ion pump “charge” the battery
Creates an electrochemical gradient for each ion
True or false
Active response only occurs when the voltage gets above threshold
True
How do you make a neuron signal
By high concentration of K+ inside the cell and high concentration of Na+ outside the cell
What does the cell membrane do
Separates the two compartments of the battery, and ion transporters “charge” the battery
True or false
You can have a voltage without a current
False
You need a current
What does ion channels allow for
Passive movement of ions across the membrane
True or false
Ion transporters are active devices
True
Sodium-potassium transporter do
Maintains the concentration of sodium and potassium
Pumps 3 Na+ out and 2 K+ in
True or false
Ion channels do not use energy
True
What does protein allow for with ion channels
Allows to make channels for ions to flow through
True or false
Ions mix with fat
False
Can ion channels be specific to allow certain ions to pass through
Yes
What does the Nernest Equation tell us
How a battery works
What does a concentration gradient of an ion want to do
To equalize their distribution
What do we need to compute the potential of a battery
The concentration of each ion in it’s gradient
If you have an equal concentration gradient inside the cell and outside the cell then what is the concentration gradient and what is the potential energy
There is none since it’s equal, therefore their can be no potential energy
If you use energy what does it go from and become
Goes from potential energy to kinetic energy
Of what ion is their a high concentration of inside the cell
K+
Resting potential is due to?
Potassium ion
Action potential is due to?
Sodium ions
What happens if you increase the K+ concentration outside the cell for resting potential
It brings the concentration gradient down therefore getting rid of the membrane voltage
What happens if you do not open the channels for ion to flow ?
There will be no voltage or current
If you have a concatenation gradient what do you need to change voltage of the membrane?
Need to open the channels
What is calcium important for?
For messager molecule
What is epsp and what does it do
Excitatory post synaptic potential and brings voltage membrane towards threshold
What is ipsp and what does it do
Inhibitory post synaptic potential and brings voltage membrane away from threshold
