Collecting Duct Physiology Question

Hi, can anyone please analyse what the circles and grey and the black ones indicate in this picture? I have no idea :pensive:


I can’t say how much I appreciate your answers everytime, tysm :smiling_face_with_tear::white_heart:

By the way, what should I type in google to find these kinds of pictures…?

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you can google histology (study of tissues)
here is a good source, although too advanced for the imat