The green structure in the image represents a developing pharyngeal arch. Considering its location and the adult structures that arise from it, which pharyngeal arch is shown below in green?

If Vascular Endothelial Growth factor (VEGF) is knocked out in mouse embryos which of the following is most likely responsible for the phenotype?  

Which factor induces myoblast specific genes that pushes cells irreversibly into the myoblast lineage?

Osteopetrosis is associated with an increase in _________________ due to a failure of the ________________.

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

Name the precordial lead labeled E in the image.   

The muscular of the heart is known as the ______________.

Which of the following would cause low hematocrit levels?

Name the Blood Vessel labeled 8.  

Name the valve labeled 16.