|The Anatomy and Physiology of Animals|
|The cell||Introduction | The Plasma Membrane | The Cytoplasm | The Nucleus | Cell Division | Summary|
The Cell As A Factory
To make the function of the parts of the cell easier to understand and remember you can compare them to a factory. For example:
- The nucleus (1) is the managing director of the factory consulting the blueprint (the chromosomes) (2);
- The mitochondria (3) supply the power
- The ribosomes (4) make the products;
- The chloroplasts of plant cells (5) supply the fuel (food)
- The Golgi apparatus (6) packages the products ready for dispatch;
- The ER (7) modifies, stores and transports the products around the factory;
- The plasma membrane is the factory wall and the gates (8);
- The lysosomes dispose of the waste and worn-out machinery.
Insert here: TYS 5
- Cells consist of three parts: the plasma membrane, cytoplasm and nucleus.
- Substances pass through the plasma membrane by diffusion (gases, lipids), osmosis (water), active transport (glucose, ions), phagocytosis (particles), pinocytosis (fluids) and exocytosis (particles and fluids).
- Osmosis is the diffusion of water through a semipermeable membrane. Water diffuses from high water "concentration" to low water "concentration".
- The cytoplasm consists of cytosol in which are suspended cell inclusions and organelles.
- organelles include ribosomes, endoplasmic reticulum, mitochondria, Golgi bodies and lysosomes.
- The nucleus controls the activity of the cell. It contains the chromosomes that are composed of DNA.
- The cell divides by mitosis and meiosis
Insert here: W/S Cell Qs 6-9