Vince Rusbosin

SLM-521

Dropin 5:

Sliding Filament Theory

The Sliding Filament Theory is an explanation of how our muscles produce force. Thin and thick filaments interact and bind with each other to slide past each other when a muscle cell contracts allowing the muscle to shorten or elongate. Explore the sites listed below to learn about the six steps of how this sequential process occurs and to answer the following questions.

http://www.sport-fitness-advisor.com/muscle-anatomy.html

http://www.blackwellpublishing.com/matthews/myosin.html

http://faculty.stcc.edu/AandP/AP/AP1pages/Units5to9/unit8/sliding.htm

1. What triggers the exposure of the actin binding sites?

2. What filament performs the power stroke?

3. What causes the re-energizing and repositioning of the cross bridge.

4. In a format similar to the graphic below, follow the number sequence and summarize in your own words each of the six steps of the sliding filament theory.

1)	2)
6)	3)
5)	4)