Sodium / Potassium Pump
The Sodium-Potassium ATPase is always _____.
The Na/K-ATPase is always on.
The Sodium-Potassium ATPase has an ________________ mechanism that requires energy in the form of ____.
The Sodium-Potassium ATPase has an active transport mechanism that requires energy in the form of ATP.
The myocyte is permeable to _________________, but not other electrolytes or proteins.
The myocyte is permeable to potassium, but not other electrolytes or proteins.
When RMP approaches threshold potential, voltage-gated sodium channels ___________ and sodium conductance _____________. This __________ the cell.
When RMP approaches threshold potential, voltage-gated sodium channels open and sodium conductance increases. This depolarizes the cell.
When serum K+ decreases, RMP becomes more ______________, and the myocytes become more resistant to ________________.
When serum K+ decreases, RMP becomes more negative, and the myocytes become more resistant to depolarization.
When serum K+ increases, RMP becomes more ___________ and myocytes __________________ more easily.
When serum K+ increases, RMP becomes more positive and myocytes depolarize more easily
When the cell is at rest, Na+ permeability is very __________ compared to K+.
When the cell is at rest, Na+ permeability is very __________ compared to K+.
Na/K-ATPase is the same thing as the Na/K pump. It serves two purposes: List them
1. It removes the Na+ that enters the cell during depolarization. 2. It returns K+ that has left the cell during repolarization.
Because the cell continuously leaks ________________, it loses _____________ charges.
Because the cell continuously leaks potassium, it loses positive charges. This is why the inside of the cell is negative and the outside becomes relatively positive. This also explains why K+ is the primary determinant of resting membrane potential.
Sodium-Potassium ATPase: For every __ Na+ ions it removes, it brings __ K+ ions into the cell.
For every 3 Na+ ions it removes, it brings 2 K+ ions into the cell.