Introduction to the Muscular – Lab Report – rose1211
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Introduction to the Muscular
12Introduction to the Muscular ANSWERS TO PRE- LAB ASSIGNMENTS[pic 1]Pre-Lab Activity 1:1. a. Muscleb. Fasciclec. Muscle fiberd. Endomysiume. Perimysiumf. Epimysisum2. a. T-tubuleb. Sarcoplasmic reticulumc. Nucleusd. Triade. Sarcolemmaf. Terminal cisternaeg. Myofibrilh. MitochondrionPre-Lab Activity 2:1. a.2. c.3. Motor neuron, muscle fiber4. NeurotransmitterPre-Lab Activity 3:1. a2. c3. glycerol4. Z-discs5. They slide past one another.Pre-Lab Activity 4:1. b2. bANSWERS TO ACTIVITY QUESTIONSActivity 1Muscle Fiber Structure FunctionConnections to Things I Have Already LearnedSarcolemmaSurrounds skeletal muscle fiber; regulates what goes in and out of cellAnother name for the plasma membrane is the plasmolemma; “sarco” means flesh and refers to skeletal muscle.SarcomereFunctional unit of muscle contractionZ-disc to Z-discSarcoplasmThe cytoplasm within a skeletal muscle fiberPacked with myofibrilsSarcoplasmic reticulumStores calciumModified endoplasmic reticulum (synthesis and transport of proteins)Terminal cisternaeTerminal end sacs of SR; stores calciumCisternae = reservoirT-tubuleInvagination of the plasma membrane that carries muscle action potential deep into the muscle fiber’s interiorT-tubule + adjacent terminal cisternae = triadMitochondrionProduces ATPAbundant in cells that have high metabolic activity: muscle fibers, liver cells, spermNucleusContains DNA; skeletal muscle fibers are multinucleateHundreds of embryonic cells fuse to produce muscle fibers; therefore, muscle fibers are multinucleate.MyofibrilSpecialized organelle in skeletal muscle fibers that contains thick filaments and thin filamentsArrangement of actin and myosin within myofibril gives muscle fiber a striated appearanceTriadT-tubule + adjacent terminal cisternae = triadTriad made of three structuresThin filamentActin, troponin, and tropomyosinSlides past the thick filament during muscle contractionThick filament MyosinContains “heads” with binding sites for both actin and ATPActivity 21. What causes the striations in this tissue?the arrangement of actin and myosin in the myofibrils Are these cells uninucleate or multinucleate?multinucleate 2. What are two functions of the connective tissue wrappings of muscles? They separate and electrically insulate portions of the muscle. What is a fascicle? a bundle of skeletal muscle fibers 3. What is released by the axon terminal?
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By: rose1211
Submitted: November 7, 2018
Essay Length: 3,321 Words / 14 Pages
Paper type: Lab Report Views: 206
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