Difference between Apparatus and System

All living things are complex structures made up of cells. These cells are grouped according to their functions and their nature to give rise to tissues and organs. Some tissues make up organs. Organs are body structures with similar physiology and functions for all members of the same species, which are responsible for carrying out specific vital functions. Depending on the function of each of these, these can be grouped into systems and devices.

It is often thought that there is no difference precisely between devices and systems. In fact, it is important to mention that the definitions of apparatus and system vary depending on several factors, that is, there is no real consensus between when it is a system and when it is an apparatus.

However, if you want to study human anatomy, you need to know and recognize the differences between these two concepts, at least in the most general and currently accepted way.

Comparison chart

Definition On the one hand, a system is a set of homogeneous organs and/or tissues. This means that there is a common morphological and functional relationship between these organs and tissues. Apparatus, on the other hand, is the set of organs that lacks homogeneity, that is, there is neither a structure nor a tissue that dictates the form and function of the others. 
Elements A system is made up of organs and tissues with similar functions and appearances. As for a device, it is usually made up of two or more systems.
examples Circulatory system, endocrine system, nervous system, immune system, lymphatic system. Digestive, respiratory, reproductive, excretory or urinary, cardiovascular and locomotor systems.

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