Cardiac Muscle Flashcards
1
Q
What does cardiac muscle have?
A
Myofibrils that contain actin and myosin myofilaments
2
Q
What is the RMP of normal cardiac muscle?
A
-90 mv
3
Q
What is the RMP in cardiac muscle caused by?
A
Selective permeability (mainly k+ efflux) and Na+/K+ pump
4
Q
What is the action potential composed of?
A
Depolarization
Plateau
Repolarization
5
Q
What is depolarization caused by?
A
Na+ influx via voltage-gated channels
6
Q
What causes plateau?
A
Ca2+ influx that balances k+ efflux
7
Q
What is repolarization caused by?
A
K+ efflux but via voltage-gated k+ channels
