ELECTRICITY Flashcards
1
Q
What did Hodgkin and Huxley discover? Using what?
A
Squid giant axon and they discovered action potentials
2
Q
What are the concentrations in the cell cytosol?
A
Low Na+
High K+
3
Q
What are the concentrations in the extra cellular medium?
A
High Na+
Low K+
4
Q
How is the K+ channel selective to K+?
A
K+ is bigger than Na+ which allows it to interact to the 4 oxygen side chains of the channel proteins, also water cannot enter the channel which is always attached to Na+
5
Q
What is the order of an action potential?
A
Something starts an action potential
- voltage gated na+ channel opens
- voltage gated k+ channels open
- voltage gated na+ closes
