CAIE A-Level Biology A2 15.1.10 Muscle Contraction Stimulation Questions

any four from:
1 competes with, acetylcholine / neurotransmitter
or
acetylcholine cannot bind to receptors
or
blocks receptors ;
$2 \mathrm{Na}^{+}$channels do not open
or
no / fewer, sodium ions enter (muscle fibre) ;
3 so, no / less, depolarisation of sarcolemma ;
4 no / fewer, action potentials/ impulses (spread across muscle fibre) ;
$5 \mathrm{Ca}^{2+}$ (voltage-gated) channels do not open in sarcoplasmic reticulum
or
no / fewer, $\mathrm{Ca}^{2+}$ ions released by sarcoplasmic reticulum ;
6 no / fewer, $\mathrm{Ca}^{2+}$ ions bind to troponin
or
no exposing of binding sites
or
no / fewer, cross bridges / AW ;

any two from:
1 affects, rib muscles / intercostal muscles / diaphragm, so unable to breathe ;
2 affects cardiac muscle so, stops blood circulation / heart failure / attack ;
3 cannot move so unable to escape from predators ;
4 cannot eat so starves ;