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TLS Online TPP Program

#Id: 4019

L-type calcium channels become inactivated (i.e., they close) within about 100 to 150 milliseconds after opening

#Unit 7. System Physiology – Animal #Blood pressure, neural and chemical regulation of Cardiovascular System #Part B Pointers
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TLS Online TPP Program

#Id: 7171

#Unit 5. Developmental Biology

During cleavage, β-catenin enters the nuclei and binds with Tcf3 to form a transcription factor that activates genes encoding proteins Siamois and Twin.
TLS Online TPP Program

#Id: 7172

#Unit 5. Developmental Biology

Siamois and Twin interact in the organizer with the Smad2 transcription factor activated by vegetal TGF-β family members (Nodal-related proteins, Vg1, activin)
TLS Online TPP Program

#Id: 7173

#Unit 5. Developmental Biology

Twin and Siamois encode homeodomain transcription factors and are expressed in the organizer
TLS Online TPP Program

#Id: 7174

#Unit 5. Developmental Biology

High β-catenin + Nodal related high + Veg T, Vg1 = Organizer 
TLS Online TPP Program

#Id: 7175

#Unit 5. Developmental Biology

Nodal related low + Veg T, Vg1 = Ventral mesoderm
TLS Online TPP Program

#Id: 7176

#Unit 5. Developmental Biology

The “default fate” of the ectoderm is to become neural tissue