Biology Pages
Kimball's Biology Pages: Muscles
A thorough discussion of the skeletal muscle, smooth muscle and the cardiac muscle. Muscular diseases are highlighted in this site as well.
Open Curriculum
Open Curriculum: Muscular System
In this resource, students learn the major role of the muscular system, about muscle fibers, the role of ATP and calcium in muscle contraction, how muscles move bones, and how muscles respond to aerobic and anaerobic exercise.
CK-12 Foundation
Ck 12: Episd: Skeletal Muscles
[Free Registration/Login may be required to access all resource tools.] Identify and describe the structure and function of the skeletal muscles in a human being.
CK-12 Foundation
Ck 12: Biology: Muscle Contraction
[Free Registration/Login may be required to access all resource tools.] Describes how muscles contract according to the sliding filament theory.
OpenStax
Open Stax: Muscle Fiber Contraction and Relaxation
This site provides young learners with information regarding muscle fiber contraction and relaxation.