Question

Put the following statements in the correct order for the events of the sliding filament theory?

Put the following statements in the correct order for the events of the sliding filament theory.
ATP is broken down

Myosin pulls on the actin for a power stroke

Troponin-tropomyosin complex detaches from the myosin head binding sites

Calcium is released from the sarcoplasmic reticulum

Myosin heads attach to actin forming a cross bridge

Calcium binds to troponin

Myosin detaches from actin

Answer 1

Calcium is released from the sarcoplasmic reticulum - Calcium binds to troponin - Troponin-tropomyosin complex detaches from the myosin head binding sites - Myosin heads attach to actin forming a cross bridge - ATP is broken down - Myosin pulls on the actin for a power stroke - Myosin detaches from actin

Explanation:

The sliding filament theory explains how muscles contract based on muscle proteins sliding past each other to generate force. The theory states that Actin and Myosin form a cross-bridge which allows them to slide past each other while remaining at a constant distance. https://en.wikipedia.org/wiki/Sliding_filament_theory#The_sliding_filament_theory

The process starts when a nervous impulse stimulates the muscle to produce Acetylcholine, the prescence of which depolarises the motor end plate and thus causes calcium to be released from the sacroplasmic reticulum, the first step.

As the calcium levels increase in the muscle, they bind with troponin, the second step. As a result, the shape of the cell is changed, which causes the troponin-tropomyosin complex detaches from the myosin head binding sites, the third step. This is important because the troponin-tropomyosin complex, when relaxed, blocks the attacthement sites for the Myosin cross-bridges, and so needs to be removed.
https://www.iptaustralia.com.au/fitness-articles/musculoskeletal-system/muscle-physiology

The next few steps occur simultaneously across all muscle fibers: Now with unrestricted access, the Myosin heads attach to Actin forming a cross bridge, the third step, Next, ATP is broken down to release energy to fuel the muscle cells in their contraction, the fourth step. With this energy, the Myosin pulls on the Actin for a power stroke, the fifth step. Because this step happens simultaneously across all muscle cells, the muscle itself shortens and contracts.

When an ATP molecule binds to the Myosin head, the Myosin detaches itself from the Actin and the cross-bridge, the last step. Once the ATP is roken down into energy, the Myosin reattaches itself to the Actin and contracts the muscle again. It will do this as long as there is enough energy, or the nervous impulses are still coming through.
http://www.teachpe.com/anatomy/sliding_filament.php

I hope I helped!