Without digestion, the food we eat would just come straight out in our poo.
Digestion happens in the digestive system. This is a series of organs that break down the food so it can be absorbed into our blood and travel around to where it is needed.

The nervous system helps all the parts of the body to communicate with each other. It also reacts to changes both outside and inside the body. The nervous system uses both electrical and chemical means to send and receive messages.
Source: https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/nervous-system

Accuracy refers to how close a measurement is to the true (accepted) value while precision refers to the reproducibility of a measurement, or how close various measurements are to one another.
Source: https://www.michelli.com/accuracy-versus-precision-the-difference-between-accuracy-precision/

Materials management, specifically in hospitals, are the strategic planning and utilization of materials and supplies essential for providing healthcare services. These materials encompass a wide range of items such as medical equipment, pharmaceuticals, surgical instruments, consumables, office supplies, and more.

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Cell is very important in our lives because it contains the fundamental molecules of life and what we are composed of.