The movements of the parts of
our body, like our arms and legs, occur because of muscle
contractions. The beating of the heart also requires muscle
contraction. However, the muscle of the heart isn't the same type of
muscle as the muscle in our arms.
In this Lesson, we'll look at
three types of muscle and see how muscle contraction occurs. We'll
also investigate how muscle contraction is regulated, at both the
molecular level and the level of the whole muscle.