twitch-mechanical response to a single action potential. Electrical stimulus-muscle contractions. Latent period- during a contraction there is a rise in muscle tension. 2. What is the role of acetylcholine in a skeletal muscle contraction? -Trigger action potential. 3. Describe the process of excitation-contraction coupling in skeletal muscle fibers. –The motor end plate produces potential and results in contraction of a single cell. 4. Describe the three phases of a skeletal muscle twitch
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neurotransmitter molecules (ACh) D. Motor Units - A.D.A.M. Physiology: Contraction of Motor Units p. 3 only 1. Small motor units (fewer myofibers innervated) 2. Large motor units (more myofibers innervated) III. Skeletal Muscle Physiology: See IP-CD: Sliding Filament Theory. A. Summary of the Sliding Filament Model of Muscle Contraction In your own words‚ write a brief summary of the process of muscle contraction. 1. _____________________________________________________________
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Introduction: In this lab‚ I will study how muscles contract‚ what makes muscles contract‚ different types of muscle contraction‚ and learn about how resistance affects muscle contraction. I will define Key Terms that describe what will occur in the experiments; I will conduct an experiment for each Activity and provide all resulting Data as well as answer Questions from each Activity. I will then provide a short Summary for what I learned in each Activity. Key Terms: Recruitment (or Multiple
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Latent-stage from rest to muscle tension begins b. Contraction-At this stage the muscle reaches its peak in contraction c. Relaxation- muscle is shortened‚ returns to zero and back initial length. 2. In Activity 2‚ how long was the latent period? ___2.2_______ msec Describe the chemical changes that are occurring during this period. Calicum levels are low since muscle contaction is not at its peak. Preparing for the the contraction Ca begin the process of sending Acetychlorine binding
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wave of excitation that travels rapidly along the cell and initiates processes leading to contraction. c. Contractility-Muscle cells are unique in their ability to shorten substantially when stimulated.-This enable them to pull on bones and other organs to create movement. d. Extensibility- In order to contract‚ a muscle cell must alson be extensible able to stretch again between contractions.- Most cells rupture if they are stretched even a little‚ but skeletal muscle cells can stretch
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bodies cells choose to get the energy that they need using oxygen to fuel metabolism. During an aerobic activity the muscle cells can contract repeatedly without fatigue. During anaerobics the muscle cell doesn’t rely on oxygen to fuel the muscle contractions. It relies on its natural body chemicals. Aerobics is a low to moderate exercise that lasts longer than ninety seconds. Anaerobic is a medium to high intensity exercise that lasts no longer than two minutes. Aerobic exercise tones you muscles
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FACTORS AFFECTING PERFORMANCE How does training affect performance? • energy systems anaerobic Alactacid (ATP/PC) Lactic acid Aerobic Process An explosive movement causes the ATP to ‘split’‚ providing energy for muscular contraction Anaerobic glycolysis – degradation of glucose without using oxygen Aerobic metabolism – breakdown of fuel in the presence of oxygen to produce ATP Source of fuel Creatine phosphate Carbohydrate Carbohydrate‚ fat and protein ATP production Rapidly
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are important in order to achieve effective improvement in endurance‚ strength‚ size and shape -Strength training can be either isotonic or isometric -The classifications of strength are: Maximum (absolute) strength- The greatest force that is possible in a single maximum contraction Elastic Strength (power)- The ability to overcome a resistance with a fast contraction Strength Endurance- The ability to express force many times over Resistance Training: -The goal of resistance training is to
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therefore produce muscle contraction? d. Where is ionic calcium stored in the contractile unit? 10. Name the model which describes muscle contraction based on the molecular changes within the cell. 11. What is the physiological meaning of “contraction”? 12. a. Name the sequence of events which converts a nerve signal into muscle contraction. b. List and briefly describe the key steps in this sequence. c. Which step is the basis of muscle contraction? d. What role
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must be handwritten and turned in with Students Name‚ Class‚ Section Number and Date at the top of the page. 1. What are the three types of muscle tissue and the main differences between them. 2. Explain the sliding filament model of muscle contraction. 3. Define the resting membrane potential and its electrochemical basis. 4. List the different types of channels and indicate what causes each one to open. 5. In relation to an Action Potential – define the terms threshold‚ hyperpolarization
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