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
∙ 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
40 -60If you want to learn more check out What is forced choice method of performance appraisal?
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CHANNEL S CLOSE
∙ NA+ LEAK IN; K+ LEAK
GATED CA2+ CHANNELS
OPEN; CA2+ ENTERS
OPEN, K+ Don't forget about the age old question of What are the 3 main areas of cognitive development that occur during adolescence?
Don't forget about the age old question of What are the mental aspects used in sports psychology?
OF MEMBRANE TO K+
MEMBRAN We also discuss several other topics like Did the english bill of rights limit the power of the monarchy?
We also discuss several other topics like What stops the stimulation for muscle contraction?
PERMEABILITY TO NA+