Cross bridge cycle

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muscle contraction

When a muscle is ready to contract, calcium in the muscle fibers exposes myosin-binding sites on actin filaments. Actin−myosin cross-bridges form. By hydrolyzing ATP, myosin heads push up against actin fibrils, contracting the sarcomere. Calcium and ATP presence enables cross-bridge cycling.

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a diagram showing the process of an ovarin cycle in which one cell is attached to

Contraction of a muscle fiber is a complex process that involves a number of rapid structural and chemical changes within the muscle fiber. The molecular mechanism of contraction is explained by the s...

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the diagram shows how cell lines are connected to each other in order to make it easier for

(2)... This process will happen continuously in a cycle as long as Ca+ and ATP are present. Rigor Mortis occurs after you die. The SR deteriorates andCa+ spills out, however there is a lack of ATP (because no oxygen). Ca+ causes myosin/actin attachment, but they cannot detach because of the lack of ATP. This leaves your muscles in a permanent binding state of binding of myosin/actin.

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an artist's rendering of a bridge in the ocean

The world's longest bridge is the Danyang–Kunshan Grand Bridge in China, part of the Beijing Shanghai High-Speed Railway. The bridge, which opened in June 2011, spans 102.4 miles (165 kilometers). Another part of that train line, the 70.8-mile (114-km) long Langfang Qingxian viaduct, is the second longest bridge in the world. The bridge averages about 100 feet (31 meters) off the ground. #AmazingWonders #AmazingBridges #AmazingChina #ManMadeWonders

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an aerial view of a bridge with cars driving on the road and trees in the background

idea Architect on Instagram: "“ON SITE: The West Line Cross-Jiangxi River Bridge nearing completion in Chengdu. Carrying the western section of the Chengdu Airport New Town ring-road and cycle-route across the Tuojiang River, a leading tributary of Jiangxi River, the 185-metre central span and smaller 55-metres spans connecting to the either riverbank create the 295-metre road, cycle and pedestrian bridge which gently curves as it crosses the river. As arches provide the most efficient…

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people are riding bikes on a bridge over the water

Some photos draw you in and don’t want to let you go, so you spend entire minutes (that feel like small eternities) sitting transfixed, with your eyes on the screen. That’s exactly the feeling we get when we look at the pics featured on this subreddit that’s entirely dedicated to showing off the beauty of infrastructure. After all, (and let’s be cheesy here for a moment) infrastructure doesn’t just connect us together physically—it also connects our hearts through the mutual adoration of…

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