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Practical 3
| Question | Answer |
|---|---|
| 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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