Answer:
When an impulse reaches the muscle fibres of a motor unit, it stimulates a reaction in each sarcomere between the actin and myosin filaments. This reaction results in the start of a contraction and the sliding filament theory.
Hope this helps! :)
Answer is B. Heliotropism
Answer:
I think the major limitation of her experiment is :
C. She cannot explain what causes the difference
To find this out, she need to find out which could be the independent variable (such as the machine, tire, wind, etc)
<em>Hope it helps answer the question! Also good luck on the test:)</em>
