Biology, 30.07.2019 16:30, annie1799

Arrange the steps in the correct order to explain how a muscle fiber contracts

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Step 1A nerve impulse moves down and axon and causes the release of acetylcholine.
Step 2Acetylecholine causes the pulse to spread across the surface of the sarcolemma.
Step 3The nerve impulse enters the T Tubules and Sarcoplasmic Reticulum, which stimulates the release of calcium ions.
Step 4Calcium ions combine with troponin, shifting troponin and exposure of the myosin binding sites to the stock.
Step 5ATP breaks ADP + P. The released energy activates the myosin crossings and leads to the slipping of thin stockmilofilament past the thick myosin membrane membranes.
Step 6The sliding of the myofilaments draws the Z lines, the sarcoma shortens, the muscle fiber contract and thus muscle contracts.
Step 7ACh is activated by acetylcholinesterase, which inhibits the nerve impulse conduction across the sarcolemma.
Step 8Nerve impulse is inhibited, calcium ions are actively traced back into the Sarcoplasmic Reticulum, using the energy of the previous ATP degradation.
Step 9The low calcium concentration causes the myosin crossings to separate from the think-in-tensile filaments and return the stockmilofilaments to their relaxed position.
Step 10Sarcomeres return to their rest lengths, relax muscle fibers and relax the muscles.

answered: Guest

i can't see the full page, therefore, can't answer it

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Use the drop-down menus to identify each labeled part of the diagram. label a: label : label c:

answered: Guest

americans began to notice growing differences between the northern and southern sections of the country. there were more people living in cities in the north, which made it more urban. more people lived on farms in the south, which made it more rural. while many people were farmers in the northern states, there were now other ways to make a living, such as working in mechanical cotton gins factories manufacturing cloth, tools and other goods. people in the north supported high tariffs on goods imported from europe because the extra cost encouraged people to “buy american” instead. in the southern states, planters did not like tariffs because they sold most of their production to europe and bought their tools from there as well. southerners believed the protective tariff was something that only northern factory owners keep their profits high. so the southern politicians came up with an idea. they would opt out. they would simply ignore the protective tariff. it was ‘null and void’ in south carolina. the state would not collect the taxes on goods imported into south carolina, no matter what the president said they had to do. this decision led to the nullification crisis.

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Arrange the steps in the correct order to explain how a muscle fiber contracts ...