Like this study set? Create a free account to save it.

Sign up for an account

Already have a Quizlet account? .

Create an account

For joints & muscles test

The sliding filament theory of how a skeletal muscle contracts involves the activities of 5 different molecules plus calcium ions?

6.Calcium ions


It is the process of muscle contraction involving the sliding of actin & myosin myofilaments past each other to shorten the length of each sacromere.

What are the 6 steps of SINGLE CROSS BRIDGE CYCLING?

1.The influx of calcium, triggering the exposure of the binding sites on actin.
2.The binding of myosin to actin.
3.The power stroke of the cross bridge that causes the sliding of the thin filaments.
4.The binding of ATP to the cross bridge, which results in the cross bridge disconnecting from actin.
5.The hydrolysis of ATP, which leads to re-energizing & repositioning of the cross bridge.
6.The transport of calcium ions back to the SR.

An ___brings about the release of calcium ions from the _______.

-Action potential
-Terminal cisternae of the SR

Calcium ions flood into the cytosol & _____, causing a ________of the troponin-tropomyosin complex.
This conformation change ____the binding sites on ____.

-Bind to the troponin
-Change in conformation

The binding of myosin to actin brings about a _____ of the cross bride, resulting in the release of ___&___.
At the same time, the cross bridge ___, pulling the ____inward toward the _____. This movement is called the "_____."
The _____has been transformed into the ____of contraction.

-Change in the conformation
-ADP & P(i)
-Thin filament
-Center of the sacromere
-Power Stroke
-Chemical energy of ATP
-Mechanical energy

The release of the myosin cross bridge from actin triggers the ____of the ATP molecule into ___&___.

-ADP & P(i)

Calcium is _____from the cytosol into the ____by ____.
As the calcium is removed, the troponin-tropomyosin complex again ____the binding sites on ____.

-Actively transported
-Ion pumps

Review of the Role of ATP [3 things]?

1.Energizing the power stroke of the myosin cross bridge.
2.Disconnecting the myosin cross bridge from the binding site on actin at the conclusion of a power stroke.
3.Actively transporting calcium ions into the SR.

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions and try again


Reload the page to try again!


Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

Voice Recording