Actin and myosin are the molecules used for muscle contraction.
Actin and myosin are essential proteins in muscle contraction.
Actin is a myofilament in skeletal muscle that is a big component of muscle contractions. Actin contains two smaller myofilaments called Troponin and Tropomyosin.
Actin and myosin are both protein molecules responsible for generating movement.
proteins
muscle that produces a give movement
ATP (--> ADP+Pi) and actin
Actin is essentially a ball ('globular') with two key features: 1. a particular region binds and hydrolyzes adenosine triphosphate (ATP); 2. Other regions allow actin molecules to bind to one another head-to-tail. I won't discuss the ATP hydrolysis here. When actin molecules bind each other, they form a spiral-staircase-like ('alpha-helical') string called a 'filament.' Multiple actin filaments come together to form bundles or fibers. These higher-order structures are so big and so prevalent that they can be seen in living cells through a microscope. The atomic structure of globular actin is available for free here: http://www.ncbi.nlm.nih.gov/Structure/mmdb/mmdbsrv.cgi?uid=47984
Micro filaments
Actin and myosin interact in muscle cells.
Actin and myosin are proteins. Protein is a broad category of molecules.
1. Actin 2. Tropomyosin 3. Troponin
ATP not ADP binds to actin-myosin and is cleaved by to ADP.
ATP molecules
TROPOMYOSIN MOLECULES ( troponin hold the tropomyosin in place)
muscle that produces a give movement
ATP (--> ADP+Pi) and actin
Regulatory molecules are commonly types of proteins which will regulate the functions of the muscles. The interaction of actin and myosin is regulated which will trigger muscle contraction.
actin and myosin are myofillaments that make up myofibrils (part of a muscle fibre) (so therefore : muscle is an actin or myosin containing structure
actin
TROPOMYOSIN MOLECULES ( troponin hold the tropomyosin in place)
Actin is essentially a ball ('globular') with two key features: 1. a particular region binds and hydrolyzes adenosine triphosphate (ATP); 2. Other regions allow actin molecules to bind to one another head-to-tail. I won't discuss the ATP hydrolysis here. When actin molecules bind each other, they form a spiral-staircase-like ('alpha-helical') string called a 'filament.' Multiple actin filaments come together to form bundles or fibers. These higher-order structures are so big and so prevalent that they can be seen in living cells through a microscope. The atomic structure of globular actin is available for free here: http://www.ncbi.nlm.nih.gov/Structure/mmdb/mmdbsrv.cgi?uid=47984