Definition

Noun: - The protoplasmic material of a living cell: "Living substance" refers to the essential, organized matter that constitutes a living cell, encompassing both the cytoplasm and the nucleus. It denotes the physical, active material responsible for the processes of life.

Usage

• This term is primarily used in biological and cytological contexts to describe the collective, functional material within a cell, as opposed to non-living structures or extracellular substances.
• It is often used in a general or textbook sense to refer to the totality of a cell's contents that exhibit life functions.

Examples

Advanced Usage

• "The living substance of the neuron": This phrase specifies the protoplasmic content of a nerve cell, highlighting its specialized functions.
• "Metabolism within the living substance": Used to describe the biochemical processes occurring in the cell's protoplasm.

Variants and Related Words

• Protoplasm (n): A nearly synonymous term for the living substance of a cell, especially the cytoplasm and nucleus.
• Cytoplasm (n): The material within a cell, excluding the nucleus. It is a major component of the living substance.
• Nucleoplasm (n): The substance within the nucleus of a cell, also part of the living substance.

Synonyms

• Protoplasm: The living content of a cell.
• Bioplasm: An older, less common term for living matter.

Notes on Meaning

• The term "living substance" emphasizes the aspect of life at the cellular level. It is a broad concept that aggregates all the metabolically active components of a cell.
• It is distinct from terms like "tissue" or "organ," which refer to higher levels of biological organization composed of many cells and their non-living matrices.

Noun

1. the substance of a living cell (including cytoplasm and nucleus)