The autonomic nervous system regulates a variety of body process that takes place without conscious effort. https://www.verywellmind.com/what-is-the-autonomic-nervous-system-2794823 Pleased explain the use of definite article "the" in "the autonomic nervous system" and indefinite article "a" in "a variety of". Is "nervous system" an uncountable noun?
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Jigneshbharati The autonomic nervous system regulates a variety of body processes that take place without conscious effort. Jigneshbharati Is "nervous system" an uncountable noun? No, it is countable, so some article or determiner is necessary.
— GPY
Jigneshbharati The autonomic nervous system regulates a variety of body processes that take place without conscious effort.
Jigneshbharati Is "nervous system" an uncountable noun?
No, it is countable, so some article or determiner is necessary.
The text uses "the" because it is talking about general properties, or giving a general definition.
It is a bit like "The hedgehog is a small spiny animal".
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