single cental nucleus, linked branched network, sarcomere, lot of mitocondria, intercalated discs linking cells
2 of 15
smooth muscle features
no striations, spindle shaped cells
3 of 15
skeletal muscle features
mulitnucleate on periphary, straiations, muscle fibers-microfibrils-saromere, scarplasic reticlum sarcolemma and t tubles(ca ions)
4 of 15
whta is syncytium
multinucleuses acting as one cell
5 of 15
syncytium in skeletal muscles
structural
6 of 15
syncytium in cardic and smooth and xplain
function- electically synchronised through gap junctions
7 of 15
whta length is sarcomere at rest
2-2.2nanometers
8 of 15
describe myosin filaments
thick, have head which bind to actin, tails have ATPase
9 of 15
describe actin filaments
contain both actin and troponin strands
10 of 15
describe stages of contraction in skeletal and cardiac muscle
1. atp hydrolysed at rest 2.ca+2 ions released and bind to troponn on actin so mysoin heads bind 3.powerstroke occurs and sarcomere contracts, adp and pi disscoiate from myosin neck and combine to form atp 4. atp binds to myosin head to it detached from a
11 of 15
describe contraction in cardiac and skeletal muscles
na ion chanels open. l type ca chanles open. ca relased
12 of 15
desribe relaxation in cardiac and skeletal muscles
ca uptake in sr, ca exchanged for 3 na, 3na exchanged for 2 k, k ion chanles open
13 of 15
where is calcium stored in smooth muscle
caveoli
14 of 15
describe contraction in smooth muscle
excitation and then depolarisation due ltype calcium chanles opening casuing ca ions to be realsed from sr which bind to protien CaM. This Ca-CaM complex activated MLCK ehich phosphorilated mysoin heads stimulating contraction
15 of 15
Other cards in this set
Card 2
Front
features of cardiac muscle
Back
single cental nucleus, linked branched network, sarcomere, lot of mitocondria, intercalated discs linking cells
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