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

TLS Online TPP Program

#Id: 1749

#Unit 4. Cell Communication and Cell Signaling

Corticosteroids and prostaglandins can also decrease expression of class II MHC molecules.

TLS Online TPP Program

#Id: 1750

#Unit 4. Cell Communication and Cell Signaling

Class II MHC transcriptional activator called CIITA and another transcription factor called RFX, have both been shown to activate the promoter of class II MHC genes.

Defects in these transcription factors cause one form of bare lymphocyte syndrome.

TLS Online TPP Program

#Id: 1751

#Unit 4. Cell Communication and Cell Signaling

Cross-presentation

TLS Online TPP Program

#Id: 1752

#Unit 4. Cell Communication and Cell Signaling

Codominant Expression

TLS Online TPP Program

#Id: 1753

#Unit 4. Cell Communication and Cell Signaling

TLS Online TPP Program

#Id: 1754

#Unit 4. Cell Communication and Cell Signaling