Cells without plasma membrane:

Cells are the basic unit of life and are characterized by the presence of a plasma membrane that separates the internal contents from the external environment. However, there are some cells that lack a plasma membrane, and these are known as enucleated cells.

What are enucleated cells?

Enucleated cells are cells that lack a nucleus and a plasma membrane. These cells are found in a variety of organisms, including mammals, birds, and reptiles. Enucleated cells are typically formed during the maturation of certain cell types, such as red blood cells and platelets.

Examples of enucleated cells:

1. Red blood cells: Red blood cells, also known as erythrocytes, are the most common type of enucleated cell in the human body. These cells are responsible for carrying oxygen from the lungs to the body's tissues. The absence of a nucleus and other organelles allows red blood cells to be more efficient at transporting oxygen.

2. Platelets: Platelets, also known as thrombocytes, are another type of enucleated cell. These cells are responsible for blood clotting and play an important role in wound healing.

3. Skeletal muscle cells: Skeletal muscle cells, also known as myocytes, are multinucleated cells that lack a plasma membrane. These cells are responsible for voluntary movement and are found throughout the body.

Conclusion:

Enucleated cells are a unique type of cell that lack a nucleus and a plasma membrane. These cells are found in a variety of organisms and play important roles in functions such as oxygen transport and blood clotting.

'Cytoplasm' is the content of the cell without plasma membrane.

Further,
Cytoplasm + plasma membrane = protoplasm