Anne is camping with her friends and stumbles upon a berry bush. She assumes tha
ID: 3514323 • Letter: A
Question
Anne is camping with her friends and stumbles upon a berry bush. She assumes that the berries are safe and decides to eat them. Suddenly, all of her skeletal muscles begin to contract simultaneously. The berries seem to be causing a direct effect on her musculature as there is no apparent problem with her nervous system. What possible mechanism of action might these berries be affecting? Support your answer using your knowledge of the events that take place during excitation-contraction coupling.
Explanation / Answer
Beriies are rich in calcium.this point explains the whole story.for this to understand u first should know about the excitation contraction coupling.
The process by which depolarization of the muscle fibre initiates contraction is called excitation contraction coupling.the two phenomenon are coupled together by coupling agent that is calcium.
Sequence of events in excitation contraction coupling
1.stimulation of motor nerve with threshold intensity produces propagated action potential.
2.relase of Ach which binds with nicotinic Ach receptors.
3.depolarisation of muscle membrane by increasing it's permeability to Na ion
4.generation of action potential in the muscle fibre.
5.spread of.depolarisation with release of Ca ion in myofibrils.
Now here the ques mainly starts.berries are highly rich in Ca so what calcium do
Calcium binds with troponin C causing tropomyosin to move laterally.this exposes the binding sites for myosin heads on actin
Calcium activates the prosthetic group of myosin filament which act as an enzyme catalysing the breakdown of ATP to produce energy for contraction of actomyosin complex and activation of sliding filament system.
There occurs the muscle contraction.
So as u can see it is the calcium here who is the culprit
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