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Practical 3

QuestionAnswer
What is the myocyte's plasma membrane called? Sarcolemma
What are sarcolemma invaginations called? Transverse (T) Tubules
What is the myocyte's cytoplasm called? Sarcoplasm
What is a myocyte's modified endoplasmic reticulum that stores Ca2+ called? Sarcoplasmic Reticulum
Which Myofibral Proteins (myofilaments) generate tension? Contractile Proteins
Which Myofibral Proteins (myofilaments) dictate when a fiber contracts? Regulatory Proteins
What are the 2 types of myofilaments? Thick and Thin
What is an example of a protein that is a Thick Filament? Myosin
What is an example of a protein that is a Thin Filament? Actin, Troponin, Tropomyosin
What is the Sliding Filament Model? -Actin myofilaments slide over myosin to shorten the sarcomeres. -Actin and Myosin do NOT change length -Shortened sarcomeres are responsible for muscle contraction -During relaxation, sarcomeres lengthen because of some external force
What is the Neuromuscular Junction (NMJ)? The connection (or synapse) where a single motor neuron communicates with many muscle fibers
Where does the NMJ transmit a nerve impulse (or action potential)? From Neuron to Sarcolemma
What structures does the NMJ include? Axon Terminal-which contain vesicles with acetylcholine, Synaptic Cleft, Motor End Plate
What is a motor unit? A single motor neuron and all it's muscle fibers -all or none principle
What is a muscle twitch? Single muscle contraction
What are the phases of a muscle twitch? 1. Latent period 2. Contraction Phase 3. Relaxation Phase
What is Multiple Motor Unit Summation (or Recruitment)? Increasing number of motor units fired during a single muscle twitch
What is Treppe? during initial contraction, the force a muscle is able to produce is less than that produced in subsequent contractions in a narrow time span
What is wave summation? Increasing stimulus frequency during a contraction
What is Tetanus? Extreme form of wave summation in which no relation occurs between contractions
What is electromyography? The electrical measurement of a muscle contraction using skin surface voltage reading
What is an electromyograph? The graph produced from the reading of electromyography.
Created by: lyd.martz
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