Definite/indefinite article usage
Must articles always be used to make sentences grammatically correct in Spanish?
Is this O.K? Avances en tecnología médica se ha extendido vida humana.
or must it always be this?
Los avances en la tecnología médica se ha extendido la vida humana.
Advances in medical technology has extended human life.
2 Answers
There are cases such as professions.
Soy médico
Alberto es bombero.
However, if you intend to be specific about something, you could add the definite article,
Es usted señor Smith (not required, any old Mr Smith)
Es usted el señor Smith ( the famous, the actual, the one and only Mr Smith)
In conclusion, I am not sure if there are any hard and fast rules or if you just have to learn instances when and when not to use them.
I would use your second sentence:
Los avances en la tecnología médica se ha extendido la vida humana.