Identify the blood vessels at the tip of the  arrow labeled “B”.   

Label “C” in the diagram below.      

Which ECG wave is represented by the letter “A”.  

Name the cavity labeled “E”  

Identify the structure at the tip of the blue arrows

Identify the blood vessels indicated by the arrows labeled “F”.

Identify the tapered region of the heart surrounded by the black circle.

Identify the histological structure at the tip of the arrow labeled “A”

Identify the vein indicated by the arrow labeled “A”  

Identify the blood vessels at the tip of the black arrow.