OCR A LEVEL PE

OCR A LEVEL PE

agonistcf-cfanswer--createscfmovement

antagonistcf-cfanswer--opposedcfthecfagonistcfprovidingcfacfresistancecfforcfco-
ordinatedcfmovement

fixatorcf-cfanswer--stabilisescfonecfpartcfofcfthecfbodycfwhilecfanothercfcausescfmovement

Isotoniccfmuscularcfcontractioncf-cfanswer--
acftypecfofcfmuscularcfcontractioncfwherecfthecfmusclecfchangescflength

concentriccfcontractioncf-cfanswer--musclecfshortenscfproducingcftension

eccentriccfcontractioncf-cfanswer--
whencfacfmusclecflengthenscfproducingcftension,cfresistscfgravitycftocfcontrolcfjointcfmovem
ent

isometriccfcontractioncf-cfanswer--
whencfacfmusclecfcontractscfbutcfdoescfnotcfchangecflength,cfhelpscfmaintaincfposture

motorcfneuronscf-cfanswer--
thesecfarecfspecialisedcfcellscfwhichcftransmitcfnervecfimpulsecfrapidlycftocfacfgroupcfofcfmus
clecffibres

nervecfactioncfpotentialcf-cfanswer--
thecfelectricalcfchargecfinsidecfthecfnervecf+cfmusclecfcellscfwhichcfconductscfnervecfimpuls
escfdowncfthecfneuronecfandcfintocfthecfmusclecffibre

phosphocreatinecf-cfanswer--
acfhighcfenergycfcompoundcfstoredcfincfthecfmusclecfcellcfusedcfascfacffuelcfforcfverycfhighcfint
ensitycfenergycfproductioncf(ATP-PCcfsystem)

mitochondriacf-cfanswer--
acfstructurecfincfthecfcytoplasmcfthatscfresponsiblecfforcfaerobiccfenergycfproduction

myoglobincf-cfanswer--
acfproteincfincfthecfmusclecfresponsiblecfforcftransportingcfoxygencftocfthecfmitochondria

smallcfmotorcfunitscf-cfanswer--
thesecfunitscfstimulatecffewcfandcfsmallcfmusclecffibres,cfthiscfcreatescfacfmotorcfunitcfwhichcf
producescfacfslowcfandcfsmallcfamountcfofcfforcecfbutcfcancfresistcffatigue

largecfmotorcfunitscf-cfanswer--
stimulatecfmanycflargecfmusclecffibrescfandcfcreatescfacflargecfforcecfrapidlycfbutcffatiguescf
quickly

, pulmonarycfcircuitcf-cfanswer--
circulationcfofcfbloodcfthroughcfpulmonarycfarterycftocfthecflungscfandcfpulmonarycfveincfbac
kcftocfthecfheart

systemiccfcircuitcf-cfanswer--
circulationcfofcfbloodcfthroughcfaortacftocfthecfbodycfandcfvenacfcavacfbackcftocfthecfheart

myogeniccf-cfanswer--
musclecftissuecfthatcfhascfthecfcapacitycftocfgeneratecfitscfowncfelectricalcfimpulsecfthatcfpas
sescfthroughcfmuscularcfwalls,cfforcingcfthemcftocfcontract

SAcf(Sino-atrial)cfnodecf-cfanswer--
locatedcfincfthecfrightcfpartialcfwall,cfitcfgeneratescfelectricalcfimpulsecfandcfforcescfwallscftocf
contract

AVcf(atrio-ventricular)cfnodecf-cfanswer--
itcfcollectscfthecfimpulsecfandcfdelayscfitcfforcf0.1cfsecondscftocfallowcfthecfatriacftocffinishcfcon
tracting.

BundlecfofcfHiscf-cfanswer--
locatedcfincfthecfseptumcfofcfthecfheart,cfitcfsplitscfthecfimpulsecfincftwo,cfsocfitscfreadycftocfbecf
distributedcfthroughcfeachcfseparatecfventricle

bundlecfbranchescf-cfanswer--itcfcarriescfimpulsecftocfbasecfofcfeachcfventricle

purkynecffibrescf-cfanswer--
thesecfdistributecfimpulsecfthroughcfventriclecfwalls,cfcausingcfthemcftocfcontract

cardiaccfdystolecf-cfanswer--thecfrelaxationcfphasecfofcfthecfcardiaccfcycle

cardiaccfsystolecf-cfanswer--thecfcontractioncfphasecfofcfthecfcardiaccfcycle

diastolecf-cfanswer--
Ascfthecfatriacfthencfventriclescfrelax,cftheycfexpand;cfdrawingcfbloodcfintocfthecfatria
Thecfpressurecfincfthecfatriacfincrease,cfopeningcfavcfvalves
Bloodcfpassivelycfenterscfthecfventricles
SLcfvalvescfclosecftocfpreventcfbloodcfleavingcfthecfheart

atrialcfsystolecf-cfanswer--thecfatriacfcontract,cfforcingcfremainingcfbloodcfintocfventricles

ventricularcfsystolecf-cfanswer--
thecfventriclescfcontract,cfincreasecfpressurecfclosingcfAVcfvalvescftocfpreventcfbackcfflowcfi
ntocfatriacf
SLcfvalvescfandcfforcedcfopencfascfbloodcfiscfejectedcffromcfventriclescfintocfthecfaortacfandcf
pulmonarycfartery

AVcfvalvescf-cfanswer--bicuspidcfandcftricuspidcfvalves

SLcfvalvescf-cfanswer--semilunarcfvalvescf(incfarteriescfleavingcfthecfheart)