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Muscles Dr Murray
Notes from Powerpoint slides from class
Question | Answer |
---|---|
What attaches skeletal muscles to bones? | Tndones |
What does insertion mean? | More moveable attachments. |
What does origin mean? | Less movable attachment where insertions is pulled towards. |
Contracting muscles cause what? | Tension on tendons which move bones at a joint. |
What are flexors? | Decrease angle of joints. |
What are extensors? | Increase angle of joints. |
What is the prime mover of any skeletal muscle? | An agonist muscle. |
What are antagonist muscles? | Flexors and extensors that act on the same joint to produce opposite actions. |
Fibrous connectice tissue from tnedons forms sheaths called ____ that extend around and into skeletal muscles. | Epimysium. |
Inside the muscle this connective tissue divides muscles into columns called? | Fascicles. |
The connective tissue around fascicles is called what? | Perimysiums. |
Muscle fibers are also called _____. | Muscle cells |
Ensheathed by thin connective tissue layers is called? | Endomysium. |
Plasma membranes are called? | Sarcolemma. |
Muscle fibers are similar to other cells except thay are? | Multinucleate and striated. |
What is the most distinctive feature of sketial musclesare? | It is striated. |
Each muscle fiber is oacked with? | myofibrils. |
Myofibrals are packed with? | Myofilaments. |
Myofilamengts are filled with? | Thick and thin filaments |
What are sarcomeres? | Contractile units of skelital muscles consisting of components between 2 Z discs. |
What are M lines? | Structural proteins that anchor myosin during contractions/ |
What is Titin? | Elastic protein attaching myosin to Z disc that contributes to the elastic recoil of muscles. |