Tissue- A group of cells with similar structure and function.
Organ- Made of tissues, may contain several tissues.
Organ system- Groups of organs that perform a certain function
Animal Tissues,Organs and Systems
Animal Tissues include:
- Muscular Tissue-Contracts to bring about movement
- Glandular Tissue-Produces substances like enzymes and hormones
- Epithelial Tissue-Covers some parts of the body
An Animal Organ example is the stomach, which contains:
- Muscular Tissue-To allow contents to move through the digestive system
- Glandular Tissue-To produce digestive juices
- Epithelial Tissue-To cover the outside and the inside of the stomach.
An example of an Animal Organ System is the Digestive system, which includes:
- Glands like the pancreas and salivary glands to produce digestive juices
- The stomach and small intestine where digestion occurs
- The liver, which produces bile
- The small intestine, where soluble food is absorbed
- The large intestine, where water is absorbed from undigested food, producing faeces.
Plant Tissues, Organs and Systems
Examples of plant tissues include:
- Epidermal Tissues, which cover the plant
- Palisade Mesophylll, which carries out photosynthesis
- Spongy Mesophyll, which has air spaces to facilitate diffusion of gases
- The Xylem and Phloem, which transport substances around the plant
Fairly obviously, the plant organs include roots, the stem and the leaves