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TLS Online TPP Program

#Id: 5304

Atrial systole 
ventricle is relaxed, & because the AV valve is open, the ventricle is filling with blood from the atrium, even prior to atrial systole.

#Unit 7. System Physiology – Animal #Cardiac cycle, heart as a pump #Part B Pointers
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TLS Online TPP Program

#Id: 7163

#Unit 5. Developmental Biology

The mRNA for the transcription factor VegT, which becomes apportioned to the vegetal cells during cleavage. VegT is critical in generating both the endodermal and mesodermal lineages.
TLS Online TPP Program

#Id: 7164

#Unit 5. Developmental Biology

One of the genes activated by VegT protein encodes the Sox17 transcription factor.
TLS Online TPP Program

#Id: 7165

#Unit 5. Developmental Biology

Sox17 
TLS Online TPP Program

#Id: 7166

#Unit 5. Developmental Biology

Another set of early genes activated by VegT encodes Nodal paracrine factors that instruct the cell layers above them to become mesoderm
TLS Online TPP Program

#Id: 7167

#Unit 5. Developmental Biology
TLS Online TPP Program

#Id: 7168

#Unit 5. Developmental Biology

Nieuwkoop center 

Dorsalmost vegetal cells of the blastula, which are capable of inducing the organizer dorsal vegetal cells can induce animal cells to become dorsal mesodermal tissue)