Mr Exham IGCSE - Cell Differentiation and Organisation

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Information about Mr Exham IGCSE - Cell Differentiation and Organisation

Published on July 14, 2013

Author: mrexham



This is a presentation designed to help explain the section of the Edexcel IGCSE Biology course about cell differentiation and organisation. For more help with IGCSE Biology please visit

MAKING SENSE OF CELL DIFFERENTIATION AND ORGANISATION IGCSE Biology 1.1 Life Processes Cell differentiation and organisation Brought to you by Image ©[julos #4371007]

• Can you explain the organisation of an organism using the following terms: organelles, cells, tissues, organs and organ systems?

• Multicellular organisms begin life as a single fertilised egg cell called a . • It then divides over and over again by Zygote Embryo

• As the developing embryo grows, cells become specialised to carry out particular roles. • This is called and is controlled by genes. • As all cells have the same genes, some must be switched on and some switched off for this to work.

• Here are a few examples of specialised cells that you will meet throughout the IGCSE Biology course. • They will be mentioned briefly here as they will be explained fully in each relevant section.

• Very long cell for carrying impulses around the body along its axon. • Insulated by a myelin sheath to make the signal travel quicker

• Sperm cells have a tail for swimming. • The head contains the genes from the father in the nucleus. • The acrosome digests its way into the egg for fertilisation.

• This cell is found in the leaves of plants. • It is packed full of chloroplasts for photosynthesis. • It is a regular shape in order to pack many into the leaf.

• This carries the water up the stem of a plant. • It is dead, hollow and strengthened in order to do this.

• Each cell has many organelles inside it’s cytoplasm to help it carry out its function. • Cells with a similar function are grouped together in . • A collection of similar tissues carrying out a particular function is called an . • In animals, jobs are usually carried out by several different organs working together. This is called an .

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