Tissue- cells in an organism that have same/similar structure and function, like muscle tissue
Organ-a part of an organism which has a specific and vital function, like the stomach.
Organ System- a group of organs that work together to carry out a particular task, like the digestive system.
Examples of specialised cells:
Red Blood Cells: contains haemoglobin to carry oxygen to cells. They have thin outer membrane to allow oxygen to diffuse through easily. Large surface area to allow more oxygen to be absorbed.
Sperm cell: fertilises an egg cell. The head contains genetic information and enzymes to help penetrate the egg cell membrane. The middle section is full of mitochondria for energy the the tail moves the sperm to the egg.
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