Every organ system is made up of parts that contribute to the functions of the whole system.
The human body is made up of many parts that have specific functions that come together to make up the whole organ system. Scientists divide them into different parts and different organ systems to better understand the individual functioning of the specific parts.
A body system is made up of body parts that work together to carry out a particular function. For example, the integumentary system that consists of skin, hair and nails that integrate together to carry out the function of protecting the body.
Another example is that of the immune system that is made up of complex organs, tissues and cells like the WBCs that form a network among each other to carry out the function of recognizing antigens and destroying them to keep infections at bay.
Two or more body systems also work together to carry out a certain function. For example the respiratory system and circulatory system come together to provide oxygen to the cells of the body and remove carbon dioxide.
This is how parts of the whole system contribute to the function of the whole system.
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