teeth - stomatology, heart - ?

CARDIOLOGY
List of words for the clue teeth - stomatology, heart - ? from the crossword:
NEUROLOGY LIVER HEPATOLOGY BRAIN FALSE ALLI ATE TWO LET CAMS BREAK COGS AORTA GNASH FANGS SAW GAP MOLARS HENS
WordClue
GUMThe flesh around the teeth
RATEof exchange or heart
BRAINstomatology - teeth, neurology - ?
HEARTstomatology - teeth, cardiology - ?
LIVERstomatology - teeth, hepatology - ?
MEDALPurple Heart
TEETHcardiology - heart, stomatology - ?
ATRIUMpart of heart
BOWELScore, heart
BRAVERYheart
DARKNESSHeart of ... (Conrad)
NEUROLOGYteeth - stomatology, brain - ?
VENTRICLEpart of heart
HEPATOLOGYteeth - stomatology, liver - ?
PERICARDIUMpart of heart
STOMATOLOGYheart - cardiology, teeth - ?
NEUROLOGYteeth - stomatology, brain - ?
HEPATOLOGYteeth - stomatology, liver - ?