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What structure is indicated by the blue arrows?

What type of tissue is indicated by the blue arrows?

Approximately how many platelets are visible in this image?  

What structures are indicated by the black arrows?

What structure in the eye is indicated by the span of the blue line (between the arrowheads)?  

The bracket labeled ‘A’ indicates a region of the cornea – what is the name for it?

What disorder are zinc ions associated with?

What structural change is associated with asthmatic bronchioles?

What characteristic is shared between cardiomyocytes and skeletal muscle fibers?

What portion of the heart is part of a serous membrane?