1.2.1 The Cytoplasm
- Cytoplasm is a matrix or ground substance in which various cellular components are found.
- It is thick semi transparent, elastic fluid containing suspended particles and a series of minute tubules and filaments that form cytoskeleton.
- Water constitutes 75-90% of the cytoplasm.
- It also contains solid components, proteins, carbohydrates, lipids and inorganic substances.
- The inorganic components exist as solutions because they are soluble in water.
- The majority of organic substances however are found as colloids. Colloids are particles that remain suspended in the surrounding medium.
The cytoplasm contains many cell organelles of which we shall learn about :
- those that trap and release energy e.g. mitochondria;
- those that are secretory or involved in synthesis and transport e.g. Golgi, ribosomes and endoplasmic reticulum
- the suicidal bags i.e. lysosomes
- the nucleus which controls all activities of the cell, and carries the hereditary material.