Explain how skeletal muscle contracts ib biology

Answer and explanation;

Contraction of skeletal muscles;

-An action potential from a motor neuron triggers the release of Ca2+ ions from the sarcoplasmic reticulum.

-Calcium ions expose the myosin heads by binding to a blocking molecule (troponin complexed with tropomyosin) and causing it to move.

-The myosin heads form a cross-bridge with actin binding sites.

-ATP binds to the myosin heads and breaks the cross-bridge.

-The hydrolysis of ATP causes the myosin heads to change shape and swivel - this moves them towards the next actin binding site.

-The movement of the myosin heads cause the actin filaments to slide over the myosin filaments, shortening the length of the sarcomere.

-Via the repeated hydrolysis of ATP, the skeletal muscle will contract.

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.