. AT&T; 2:08 PM blackboard.iu.edu Chapters 9-10 Take Aways From Chapters 9&10 le
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. AT&T; 2:08 PM blackboard.iu.edu Chapters 9-10 Take Aways From Chapters 9&10 lectures and related labs, understand the following concepts and ideas. Also be able to answer all questions, definitions, figures, etc. related to the chapters in your journal. Define and/or describe the following (many are also found in your diagram journal) o Excitability o Origin o Insertion o Action o Muscle fiber o Epimysium o Endomysium o Tendon o Fascicle o Ttubule Sarcoplasmic Reticulum (SR) o Triad o Sarc o Mys- or myo- o Action potential o Sarcomere o Myofibril o Actin o Myosin o Distinguish between the appearance of cardiac, smooth, & skeletal muscle o What are the functions of the muscular system o What structures are part of the muscular system? o Define and/or describe the following and their role in a muscle contraction: o Cross bridge o Axon o Axon terminal o Synapse o Synaptic cleft o Motor unit o Synaptic vesicle o Neurotransmitter o Acetylcholine (Ach o Motor end plate o Ttubule o Sarcoplasmic Reticulum (SR) o Calcium (Ca2+) o Ach receptors o Action potential o Depolarization the initial influx of Na+ into the sarcolemma causes a change in the membrane polarity (inside becomes more positive)Explanation / Answer
Excitability- reaction or response of a tissue to stimulation. Origin - fixed attachment of skeleton muscle to bones by means of tendon insertion - moves with contraction action - particular movement of a muscle in relation to a joint or body part moved Muscle fibre - muscle mass is made up of large no if muscle cells also known as muscle fibres, they are elongated in shape. epimysium - connective tissue sheath covering the muscle. Perimysium - in a muscle muscle fibre are arranged in fasciculi , connective tissue sheath covering each fasciculi is called perimysium endomysium - each muscle fibre is cover by endomysium tendon - muscle fibres are attached to a tough cord of connective tissue called tendon , i.e. In turn attached to bone. Fascicles- bundle or group of muscle fibres sarcolemma - plasma membrane covering the muscle fibres t tubules - invagination of sarcolemma in to the muscle fibre . sarcoplasmic reticulum - these are L tubules , they store large quantities of calcium ion which are releases during action potential. Sarcomere - structural and functional unit of a skeletons muscle. Basic contractile unit myofibril- fine parallel filaments present in the sarcoplasm of the muscle cells. Action potential - series of electrical changes that occurs In the membrane potential when a muscle is stimulated. Skeletal and cardiac muscles are striated while smooth muscles are non striated
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