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During embryonic development the vessels of the vasculature must correctly connect. Which of the following molecules mediate this event?  

 If you treated embryos with a Notch inhibitor, how would this affect the specification of venous and arterial endothelial cells?  

All heart cells derive from a common progenitor referred to as the ___________. Fill in the blank with the best answer.

Mesodermal cells at the site of the limb buds respond to beads soaked in FGF8 and grow out along the proximal-distal axis. Beads expressing FGF8 are placed under the epithelium of the back and no outgrowth is observed. This experiment demonstrates which of the following?  

Which of the following cells makes the greatest contribution to bone length during development?    

There are many recurring themes involved in patterning a developing organism. Which of the following themes below definitionally relies on a concentration threshold to regulate cell specification.

During an EKG, what does the P-wave represent?      

Name the valve labeled 16.   

What structure is labeled number 1 on the diagram?  

Name this type of tissue and what the dark bands are (these are unique to this tissue).