Cells, tissues and organs - key points

01west
Mind Map by 01west, updated more than 1 year ago
01west
Created by 01west about 6 years ago
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GCSE Biology (Cells, tissues and organs) Mind Map on Cells, tissues and organs - key points, created by 01west on 03/20/2014.
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Cells, tissues and organs - key points
1 Animal and plant cells
1.1 Most human cells are like most other animal cells and contain a nucleus, cytoplasm, cell membrane, mitochondria and ribosomes.
1.2 Plant and algal cells contain all the structures seen in animal cells as well as a cell wall. Many plant cells also contain chloroplasts and a permanent vacuole filled with sap.
2 Diffusion
2.1 The greater the difference in concentration, the faster the rate of diffusion.
2.2 Diffusion is the net movement of particles from an area where they are at a high concentration to an area where they are at a lower concentration.
2.3 Dissolved substances and gases such as oxygen move in and out of cells by diffusion.
3 Tissues and organs
3.1 A tissue is a group of cells with similar structure and function.
3.2 Organs are made of tissues. One organ may contain several types of tissues.
4 Specialised cells
4.1 Cells may be specialised to carry out a particular function.
4.2 Examples of specialised cells are fat cells, cone cells, toot hair cells and sperm cells.
5 Organ systems
5.1 Organ systems are groups of organs that performs a particular function.
5.2 Plants organs include stems, roots and leaves.
5.3 The digestive system in a mammal is an example of a system where substances are exchanged with the environment.
6 Bacteria and yeast
6.1 A bacterial cell contains of cytoplasm and a membrane surrounded by a cell wall. The genes are not in a distinct nucleus.
6.2 Yeast is a single-celled organism. Each cell has a nucleus, cytoplasm and a membrane surrounded by a cell wall.
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