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Diuretics work by flushing out excess salt and water from your body through your urine. This takes some of the water out of your blood. As the amount of blood in your blood vessels falls, so does your blood pressure.
I read the above on one of the nhs websites.
Please explain grammatical form and function of "as" and "so" in "as the amount of blood...
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JigneshbharatiPlease explain grammatical form and function of "as" and "so"
JigneshbharatiAs the amount of blood in your blood vessels falls, so does your blood pressure.

During the time the amount of blood in your blood vessels falls, your blood pressure does (fall) too.

Similar examples found online:

As the mass or density increases, so does the strength of gravitational pull.
As the severity of the stress increases, so does the production of the proteins.
As the internet weaves its way into more devices, so does encryption technology.

Combining an as-clause with a so-clause like this expresses simultaneous effects in two variables.

CJ