Eukaryotic Cell Organisation (AQA A Level Biology): Revision Note
Exam code: 7402
The organisation of cells
In multicellular organisms, eukaryotic cells become specialised to carry out specific functions
e.g. Epithelial cells in the small intestine absorb nutrients
e.g. Red blood cells transport oxygen
Specialised cells of the same type form a tissue
A tissue = a group of similar cells working together
e.g. Epithelial tissue absorbs food in the small intestine
e.g. Muscle tissue contracts to produce movement
Tissues combine to form an organ
e.g. The heart contains muscle, connective and vascular tissues
Organs work together as part of an organ system
e.g. The heart is part of the circulatory system
Examiner Tips and Tricks
Learn biological examples at each level: cell → tissue → organ → organ system
Specialised cell | Tissue | Organ | Organ system |
|---|---|---|---|
epithelial cell | epithelial tissue | stomach | digestive system |
muscle cell | muscle tissue | bladder | urinary system |
neurones (nerve cells) | nervous tissue | brain | central nervous system |
rod and cone cells | retina (nervous tissue) | eye | visual system |
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