produces movement and different types of contraction.(M3) Sliding filament theory. Each muscle fibre is made up of smaller fibres called myofibrils. These contain even smaller structures called actin which is a thin‚ contractile protein filament‚ containing ’active’ or ’binding’ sites and myosin filaments which are a thick‚ contractile protein filament‚ with Myosin Heads. These filaments slide in and out between each other to form a muscle contractions‚ this is why it is known as the sliding filament
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titled: “Computer Graphing Using Microsoft Excel®” for help with this process. 2. Graph all three sets of data on one graph. Label the three muscles on the graph. Then‚ graph each muscle set on three separate graphs. Label the latent period‚ contraction phase and relaxation phase on the three separate graphs. Connect the dots of the scatter plot graph to make a line graph for each muscle. Data Table 1A: Muscle twitch of the lateral rectus eye muscle|| Time (milliseconds)|Tension (kilogram-force)|
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phase‚ ~3 msec‚ the interval from stimulus application until the muscle begins to shorten b) contraction phase‚ ~27 msec‚ the muscle fibers shorten c) relaxation phase‚ 110 msec‚ the muscle fibers relax & lengthen 7. 1) d 2) c 3) e 4) f 5) b 6) a 8. 1) rapid 2) lactic acid 3) more 10. The muscle become paralyzed & flaccid‚ & atrophy 11. As the load on a muscle increases‚ its strength of contraction also increases until the muscle reaches maximal force generated. 12. The way the skeletal
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designed to observe a baseline heart rate and blood pressure and to examine various modifications of the two. This experiment utilized both the BiopacPro and PhysioEx computer programs. The PhysioEx program was used to simulate a heart rate and modifications to it. The BiopacPro program was used to monitor a volunteer’s blood pressure; while PhysioEx was again used to monitor the modifications to it. Heart rate was shown to decrease as temperature decreases‚ increase in the presence of epinephrine‚ and
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Lab Analysis Questions (5 pts each) 1. Explain the effect that periods of recovery have on the force of a muscle‚ as compared to a continuous multiple stimulus fatigue. When a stimulus is provided‚ the muscle twitch is divided into latent‚ contraction‚ and relaxation. If continuous multiple stimuli are provided to a muscle without letting it to relax and recover its original shape‚ the muscle gets fatigued and cannot work properly 2. Does the
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Biomechanics of Injury: Notes Sports injuries are divided into two categories: Acute and Chronic Acute Injury Acute injuries occur suddenly when playing or exercising. E.g. sprained ankles‚ strained back and fractured hands are acute injuries. Signs of acute injury include: Sudden severe pain Swelling Inability to place weight on a lower limb Extreme tenderness in an upper limb Inability to move a joint through full range of motion Extreme limb weakness Visible dislocation/break
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Muscle Physiology Purpose: What is the purpose of this exercise? Are there any safety concerns associated with this exercise? If so‚ list what they are and what precautions should be taken. Refer to the appendix of this manual if you need a tutorial on how to make graphs in Microsoft Excel®. Exercise 1: Muscle Twitch Data Table 1A: Muscle Twitch of Rectus Data Table 1B: Muscle Twitch of Lateralis Eye Muscle Quadriceps Femoris Time (milliseconds) Tension (kilogram-force)
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A motor unit consists of a ___1___ and all the ___2___ it innervates. Whole muscle contraction is a(n) ___3___ response. A ___4___ is the response of a muscle to a single‚ brief threshold stimulus. When the frequency of stimulation is so high that the muscle tracing shows fused peaks‚ ___5___ has been achieved. ___6___ is the stimulus strength at which the first observable muscle contraction occurs The phenomenon‚ called ___7___‚ brings more and more muscle fibers into play
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PDH study Summary What reasons do people participate in outdoor rec? (SCSPSEA) * Stress management * Challenge and excitement * Social interaction * Personal growth * Self-sufficiency * Enjoyment * Appreciation of the environment Planning for outdoor rec (RFLCCN) Ralph Freaking Lauren Cuts Clothes Neatly/Nicely * Risk assessment * Finding the hazards identifying the risks * Management – working out how to combat or avoid them. * Food and water
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8. Isotonic contraction (“same tone” or tension) - In isotonic contractions‚ myofilaments are successful in their sliding movements‚ the muscle shortens‚ and movement occurs. Contractions in which the muscles do not shorten are called isometric contractions (“same measurement” or length). In isometric contractions‚ the myosin mysofilaments are “skidding their wheels‚” and the twnaion in the muscle keeps increasing. 9. Muscle tone is a state of continuous partial contractions. Muscle tone
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