4 videos
Without muscles, we wouldn't be able to do much of anything. This tutorial explores what muscle cells are and how they contract to let us move our bodies.

Myosin and actin

VIDEO 9:38 minutes
How myosin and actin interact to produce mechanical force.

How tropomyosin and troponin regulate muscle contraction

VIDEO 9:22 minutes
How calcium ion concentration dictates whether a muscle contracts or not.

Role of the sarcoplasmic reticulum in muscle cells

VIDEO 14:42 minutes
The role of the sarcoplasmic reticulum in controlling calcium ion concentrations within the muscle cell.

Anatomy of a skeletal muscle fiber

VIDEO 16:32 minutes
Understanding the structure of a muscle fiber.