<prompt> Intrauterine pressure is raised during labour to :First stage -- 40-50 mmHgSecond stage -- 100-200 mmHgThird stage -- 100-200 mmHgAll of the above  <response>: Intrauterine pressure is raised to 40-50 mmHg in the first stage 100-200 mmHg in the second stage 100-200 mmHg maintained in the third stage The diminished pain is due to lack of stretching effects D.C.DUTTAS TEXTBOOK OF GYNECOLOGY,Pg no:117,7th edition 