Learn more: http://www.khanacademy.org/video?v=zopoN2i7ALQ
How myosin and actin interact to produce mechanical force.

Length: 9 minutes

Tropomyosin and troponin and their role in regulating muscle contraction

Length: 14 minutes

Role of the Sarcoplasmic Reticulum in Muscle Cells

Length: 16 minutes

Anatomy of a muscle cell