Santa answers Medical Terminology

Have you heard of Mr. Santa Singh applying to a medical school to become a doctor?
Needless to say he never made it. You know why?
These are the answers he wrote in his entrance exam.
Antibody - against everyone
Artery - The study of the paintings.
Bacteria - back door to a cafeteria.
Caesarean section - a district in Rome.
Cardiology - advance study of poker playing.
Cat scan - searching for lost kitty.
Chronic - neck of a crow.
Coma - punctuation mark.
Cortisone - area around local court.
Cyst - short for sister.
Diagnosis - person with slanted nose.
Dilate - the late British Princess Diana.
Dislocation - in this place.
Duodenum - couple in blue jeans.
Enema - not a friend.
Fake labour - pretending to work.
Genes - blue denim.
Hernia - she is close by.
Impotent - distinguished/ well known.
Labour pain - hurt at work.
Lactose - people without toes.
Lymph - walk unsteadily.
Microbes - small dressing gown.
Obesity - city of Obe.
Pacemaker - winner of Nobel peace prize.
Proteins - in favour of teens.
Pulse - grain.
Pus - small cat.
Red blood count - Dracula.
Secretion - hiding anything.
Tablet - small table.
Ultrasound - radical noise.
Urine - opposite of you're out.
Varicose - very close.