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bmc biochemistry tehmas practical mbbs 2nd year cell membrane acid-base balance acid and base balance 脿肠颈诲-产补蝉别 handover triglycerides serum bilirubin bilirubin estimation bilirubin serum albumin albumin cell transport 1st year cell organelles cell 2nd lecture membrane lecture healthcare meeting corona virus covid19 covid presentation morning meeting microbiology meningitis in over 1 month bacterial meningitis discussion question paper stage god method glucose rbs blood urea nitrogen nitrogen urea blood bun dr. tehmas