If you looked at blood through a microscope would it look totally the same throughout?

Answer 1

No. Blood consists of plasma (liquid, mostly water). But it also contains many cells (leukocytes, erythrocytes). It also contains many large proteins such as albumin that are extra-cellular. If your resolution was high enough, you might even detect some smaller proteins like naked antibodies.

Answer 2

I'm guessing you are asking something like "If I look at blood drawn from the arm, would I be able to tell the difference between it and, say, blood drawn from the leg" If this is the question, my answer is this: You wouldn't be able to tell the difference. You'd basically see RBCs, WBC, and Platelets in the same amounts at both sites.
However, because blood cells come from bone marrow, You'd find something entirely different when looking at marrow under the microscope. You'd see relatively large white cells, nucleated RBCs (which are very young RBC's and not normally seen in the blood stream), and the largest cell--the megakaryocyte--which breaks down into platelets before going into the peripheral blood stream.

Answer 3

Yes.

Answer 4

Please see Google search for the images of Human blood.