The fluid present between the cell membrane and nucleus is called cytoplasm.

What is cytoplasm?
Cytoplasm is a jelly-like substance that fills the space between the cell membrane and the nucleus in a cell. It is found in both prokaryotic and eukaryotic cells.

Composition of cytoplasm:
Cytoplasm is composed of various components that play important roles in the functioning of the cell. These components include:

1. Cytosol: Cytosol is the liquid component of cytoplasm that is mainly composed of water. It contains various molecules such as proteins, ions, nutrients, and waste products.

2. Organelles: Within the cytoplasm, various organelles are suspended, including mitochondria, endoplasmic reticulum, Golgi apparatus, ribosomes, and lysosomes. These organelles perform specific functions necessary for the cell's survival and maintenance.

3. Cytoskeleton: The cytoskeleton is a network of protein filaments that provides structural support to the cell and helps in cell movement and shape maintenance. It includes microtubules, microfilaments, and intermediate filaments.

4. Inclusions: Inclusions are non-living substances present in the cytoplasm. They can include storage granules, pigments, and other substances that are temporarily stored by the cell.

Functions of cytoplasm:
The cytoplasm plays a vital role in the overall functioning of the cell. Some of its functions include:

1. Cellular metabolism: Many metabolic reactions occur in the cytoplasm, including protein synthesis, lipid metabolism, and carbohydrate metabolism. Enzymes and other molecules necessary for these reactions are present in the cytoplasm.

2. Transport: The cytoplasm serves as a medium for the transport of molecules within the cell. It allows the movement of nutrients, ions, and other important molecules between organelles.

3. Cellular support: The cytoskeleton provides structural support to the cell and helps in maintaining its shape. It also plays a role in cell division and movement.

4. Storage: The cytoplasm stores various molecules such as glycogen, lipids, and proteins, which can be utilized by the cell when needed.

In conclusion, the fluid present between the cell membrane and nucleus is called cytoplasm. It is a complex mixture of various components that play crucial roles in the functioning of the cell.

Cytoplasm is the fluid that fills a cell. ... There is special fluid in the mitochondria, endoplasmic reticulum, Golgi apparatus, and nucleus. The only two 'plasms' left are cytoplasm (the fluid in the cell also called cytosol) and nucleoplasm (the fluid in the nucleus).