Muscle Contraction - whereas the myosin filaments are...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Zak Murdock Mr. Voytek AP Biology Period 1 15 May 2008 Muscle Contraction Many behavioral and physiological responses depend on muscle cells. Muscle cells are specialized cells for the contraction of muscles and they also contain high densities of actin and myosin. Muscle cells are responsible for wherever whole tissues contract in animals and are found throughout the animal kingdom. Therefore, wherever there is muscle, actin and myosin are present in the muscle cells. Actin and myosin are the two major proteins of muscle and they make up the microfilaments found in most eukaryotic cells. Actin and myosin molecules are organized into microfilaments consisting of two or more molecules. The actin filaments consist of a twisted chain of actin molecules,
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: whereas the myosin filaments are bundles of many myosin molecules. Both the actin and myosin filaments lie parallel to each other. Therefore, when contraction is triggered, the actin and myosin filaments slide past one another in a telescoping manner, thus allowing for muscle cells to contract. Like plasma membranes of neurons, those of muscle cells can generate action potentials. These action potentials that are generated trigger the contractile machinery of the muscle cells. Due to the fact that actin and myosin are the two major proteins in muscle cells, they serve a great deal of importance in muscle contraction as well as for the overall function of an eukaryotic organisms body....
View Full Document

Ask a homework question - tutors are online