of the bullfrog that was removed at the hip joint through careful dissection of the muscle away from the tibo-fibula bone while leaving the it attached to the knee and heel. The muscle was consistently moistened by Ringer’s solution throughout the entire experiment. The Achilles tendon was removed at the heel of the frog. The tibiofibular bone was cut below the knee and the femur below the knee (Frog Skeletal Muscle Experiement). The baseline value of the force transducer was set to zero. This zeroing
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Frog Skeletal Muscle The aim of this experiment is to explore the basic physiological principles of skeletal muscle using the isolated frog (Rana pipiens or Xenopus laevis) gastrocnemius muscle. Students will dissect a double-pithed frog. Then‚ they will connect the muscle to the Force Transducer to measure twitch recruitment‚ effect of stretch‚ muscle summation‚ muscle tetanus‚ and muscle fatigue. Written by staff of ADInstruments. Experiment Contents 1. Instructor’s Reference (this
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In this lab report I will be talking about exercise 3‚ the skeletal muscle lab. I will be going over the contraction of a frog’s gastrocnemius muscle. An overview of muscle contraction is based on the organization of the cytoskeletal proteins. The contraction is the shortening of a sarcomere‚ which is caused by the thick myosin filaments sliding past the thin actin filaments. The actual filaments aren’t getting shorter just sliding past each other. The contraction is caused by physical interaction
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Introduction Muscle is one of the four main types of tissue‚ and is primarily involved in movement. There are three types of muscle tissue: skeletal‚ smooth‚ and cardiac. Skeletal muscle was investigated in this lab. Skeletal muscle is composed of two filaments called actin and myosin‚ which run parallel to each other. Actin has a protein that run along it called tropomyosin‚ that prevents actin from binding to it‚ unless calcium is bound to a part of the tropomyosin called troponin. Sets of actin
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MECHANICAL PROPERTIES OF SKELETAL MUSCLE USING FROG GASTROCNEMIUS AIM The purpose of this experiment was to demonstrate the physiological as well as mechanical properties of skeletal muscle using the gastrocnemius muscle of a frog by exploring five different investigations namely the single twitch‚ the graded response‚ the relationship between muscle length and tension‚ muscle tetanus‚ and muscle fatigue. These individual experiments aim to explore the way muscles can contract when an electrical stimulus
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2017 Motor Unit Recruitment and Muscle Fatigue Lab Introduction Human skeletal muscles are made up of hundreds of cylindrically-shaped cells called myofibers‚ and they are bound together by connective tissue. These muscles are stimulated to contract by somatic motor nerves‚ or motor neurons‚ that carry signals in the form of nerve impulses from the brain or spinal cord‚ to the skeletal muscles. Although a motor neuron can innervate several fibers‚ each muscle fiber can only be innervated by one
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of three different muscle types cardiac‚ smooth‚ and skeletal muscle. For this particular experiment the primary focus was skeletal muscle‚ which accounts for about 36% to 45% of total body weight and involves the integration of more than 600 different muscles (WordPress‚ 2006). Skeletal muscle contains many unique properties such as; elasticity and extensibility which allows a muscle to be stretched and return to its original state when not in use. Additionally skeletal muscles also contain a property
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Introduction: Skeletal muscle cells are specialized cells that contain multinucleated muscle fibers called myocytes. These myocytes contain thicker fibers that facilitate the release of calcium‚ the generation of an action potential within the sarcolemma‚ and the subsequent production of a muscle contraction. Muscle contractions are a direct byproduct of motor unit recruitment‚ and for this lab we can examine these effects with aid of a finger pulse transducer and a bar stimulus electrode. The
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muscle contraction Introduction For a skeletal muscle fiber to contract‚ a stimulus must be applied to it. The stimulus is delivered by a nerve cell‚ or neuron. A neuron has a threadlike process called and axon that my run 91 cm or more to a muscle. A bundle of such fibers from man different neurons composes a nerve. A neuron that stimulates muscle tissue is called a motor neuron. The motor neuron branches into terminal structures called telodendria that come into close approximation with
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In this lab‚ we are measuring the EMG amp (mV)‚ or electrical activity‚ from action potentials produced from muscle contractions in order to gain an indication of the number of active motor units used in the contraction. This is done by adding more load to the muscle or force. There is examining of the EMG amp produced from a twitch at varying levels of muscle force and EMG amp from muscles when more load is placed on them. During the experiment‚ we set up the equipment‚ electrodes and software
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