How can this image be improved?

ID structure (thin white line)

Which uterine layer is being measured in the image below?  

ID structure (blue/purple depression ONLY) note:  it is not an entire layer itself. It is part of a layer

Determine the mass of nitrogen that can be formed from the reaction between [a] g N2O4 and [a] g N2H4.  Some possibly useful molar masses are as follows:  N2O4 = 92.02 g/mol, N2H4 = 32.05 g/mol. N2O4(l) + 2 N2H4(l)  →  3 N2(g) + 4 H2O(g)

ID structure (yellow line) note:  this is a medial view of the hip and femoral region

Is the bladder for this transabdominal ultrasound full enough to scan?  (Why or why not?)  

Determine how much of the excess reactant is left over if [a] g of hydrogen and [a] grams of oxygen gas reacted according to the following balanced reaction.  2H2 (g) + O2(g)

What is identified by letter ‘A’ in the image below?

What is the hyperechoic area the arrow is pointing to in the image below?