The semi-fluid or gel-like substance in which the nucleus and other organelles are embedded is called cytoplasm.

Here's a breakdown:

* Cytoplasm: This is the region of the cell that is enclosed by the cell membrane and contains the cytosol and organelles.

* Cytosol: This is the fluid portion of the cytoplasm, primarily composed of water, dissolved nutrients, ions, and proteins.

* Organelles: These are specialized structures within the cytoplasm that perform specific functions for the cell.

So, the cytoplasm is the overall environment within a cell that provides a medium for organelles to function and interact.