(a)[4]
Describe how the release of calcium ions brings about contraction of a sarcomere.
(b)[4]
Suggest how bungarotoxin may bring about muscle paralysis.
Biology 9700 · AS & A Level · Control and coordination in mammals
Control and coordination in mammals — practice question
Myofibrils in striated muscle are made up of contractile units known as sarcomeres. When an impulse causes striated muscles to contract, calcium ions are discharged from the sarcoplasmic reticulum.