CARDIAC MUSCLE (CARDIOCYTES)
∙ STRIATED, BRANCHED
∙ INTERCALATED DISCS: CONNECT CELLS TO EACHOTHER o DESOSOMES (RESISTANT TO PULING; KEEP CELL
o GAP JUNCTIONS (TUNNELS FOR IONS)
o FUNCTIONAL SYNCYTIUM
ALL WORKING TOGETHER
∙ MYOGLOBIN (BINDS O2 IN CELLS)
∙ MANY MITOCHONDRIA (AEROBIC)
o 25% OF VOLUME
60% ATP FATTY ACIDS
35% ATP GLUCOSE
∙ CONTRACT IN RESPONSE TO ACTION POTENTIALS GENERATED BY AUTORHYTHMIC CELLS (PACEMAKER CELLS)
∙ TYPES OF CELLS
o AUTORHYTHMIC CELLS (1%)
CONDUCT ELECTRICAL SIGNALS
o CONTRACTILE CELLS (CARDIOCYTE)
99% OF HEART
CONTRACT (PUMP BLOOD)
∙ CONNECTIVE TISSUE
o PHYSICAL SUPPORT
o PREVENTS OVERSTRETCHING
o DISTRIBUTE CONTRACTION FORCES
o **ELECTRICALLY INSULALTES ATRAI FROM VENTRICLES SEPARATES TOP FROM BOTTOM If you want to learn more check out What role does psychology play in criminal justice?
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∙ SINOATRIAL NODE = PACEMAKER
∙ ATRIOVENTRICULAR NODE
∙ AV BUDNLE; BUNDLE BRANCHES; PERKINJE FIBERS **ALL CELLS ABLE TO SPONTANEOUSLY DEPOLARIZE** ∙ PACEMAKER POTENTIAL
o CELLS CANNOT MAINTAIN A STABLE RESTING
CHANNEL S CLOSE
∙ NA+ LEAK IN; K+ LEAK
GATED CA2+ CHANNELS
OPEN; CA2+ ENTERS
∙ *REPOLARIZE If you want to learn more check out What are the 3 main areas of cognitive development that occur during adolescence?
OF MEMBRANE TO K+
MEMBRAN If you want to learn more check out How was james ii an absolute monarch?
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PERMEABILITY TO NA+