Organisation of Cells and Tissues
Human Biology (Year 11) - Cells and Tissues
The Organisation of the Human Body
The human body is organised in a hierarchy of structures. This organisation allows the body to function properly. The smallest functional unit of these structures is the cell. There are many different types of cells in the body with specialised functions. Cells of similar structure and functions are organised together into tissues. There are four different tissue types with many subtypes that perform a variety of functions throughout the body. Groups of tissues are organised together into organs to perform a specific function. Organs then work together in organ systems to achieve a specific goal.
For example, the digestive system consists of multiple organs (such as the stomach, intestines, pancreas, and liver), each with their own function, but each working together to digest and absorb the food we eat. Different organ systems are organised together to make up the organism and keep the organism alive.
Further examples include the cardiovascular system, which is responsible for transporting blood, while the digestive system digests and absorbs nutrients from food. The cardiovascular system picks up absorbed nutrients from the digestive system and distributes them throughout the body so all the cells can receive the nutrients they need to function.
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