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.
Estrella Mountain Community College
Estrella Community College: Animal Cells and Tissues
Notes on different tissues of the body such as: connective, epithelial, muscle, and nervous. Helpful terms and definitions as well as review questions. Colorful graphics of important terms are also provided.