1. On the following Transmission Electron Micrograph of a human acinar cell, identify the structures labeled A, B, C and D by name.
2. Provide supporting evidence justifying how the structure, shape and contrast tell you, the observer, what structure you are looking at.
3. Record your results in a table.

Structure A represents a sodium-potassium pump. Structure B represents the plasma membrane. Structure C represents the cytoplasm and structure D represents the nucleus.

We can arrive at this answer because:

The nucleus is the central part of the cell and is located after the cytoplasm and the plasma membrane.
The cytoplasm is the anterior part of the nucleus and refers to a gelatinous structure where the cell organelles are.
The plasmatic membrane is what lines the cell, delimiting it and separating it from the external environment.
Sodium-potassium pumps are proteins inserted into the plasma membrane that limit the entry and exit of large molecules into the cell.

All structures are essential for the proper functioning of an animal cell.

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