Large multicellular organsims such as humans have bodies that are organised into different organ systems. Parts of the body, increasing in size:
1. Differentiated cells
2. Tissues
3. Organs
4. Organ systems - these often exchange substances between the body and the environment e.g. the digestive system
Tissues
During development, cells specialise to perform different functions. A group of specialised cells is a tissue, where they have a similar structure and function
- Nerve tissue
- Carries electrical impulses around the body and brain
- Nerve cells have long fibres to carry electrical impulses
- Glandular tissue
- Secretes substances e.g. hormones or enzymes
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