BES1 & BZR1 give BR response

Phosphorylated BIN2 inhibits BES1 & BZR1 

Phosphorylated BIN2 is degraded by BSU1 

BSK proteins activate BSU1 phosphatase.

BRI1–BAK1-BR complex activates BSK

TLS Online TPP Program

#Id: 3964

#Unit 7. System Physiology – Animal

Conducting cells are specialized muscle cells which function to rapidly spread action potentials over the entire myocardium.

TLS Online TPP Program

#Id: 3973

#Unit 7. System Physiology – Animal

The action potential spreads throughout the myocardium in the following sequence: SA node  Atrial internodal tracts and atria  AV node  Bundle of His  Purkinje system  Ventricles

TLS Online TPP Program

#Id: 3975

#Unit 7. System Physiology – Animal

TLS Online TPP Program

#Id: 3978

#Unit 7. System Physiology – Animal

Myocardial fibers have a resting membrane potential of approximately –90 mV.

TLS Online TPP Program

#Id: 3979

#Unit 7. System Physiology – Animal

The individual fibers are separated by membranes, but depolarization spreads radially (syncytium) because of the presence of gap junctions.

TLS Online TPP Program

#Id: 3984

#Unit 7. System Physiology – Animal

In cardiac muscle, the action potential is caused by opening of three types of channels

Voltage activated fast sodium channels 

L-type calcium channels (slow calcium channels or calcium-sodium channels)

Voltage activated potassium ion channels