REVIEW SHEET EXERCISE 2 Skeletal Muscle Physiology NAME: Jasmine Young LAB TIME/DATE: 1. Define each of the following terms: • motor unit - A motor unit consists of a motor neuron and all of the muscle fibers it innervates. • twitch - Skeletal Muscle twitch is the mechanical response to a single action potential. It has three phases known as the latent‚ contraction‚ and relaxation phase. • threshold - the threshold is the minimal stimulus needed to cause a depolarization of the muscle plasma membrane
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Muscle Strain Overview- Muscle strain‚ also termed as muscle tear and muscle pull is related to the muscle damage and its attached tendons. It occurs when you give excessive pressure on muscles during performing daily life activities like during sports or heavy weight lifting.it can be in the form of tearing of the fibres of your muscles and attaching tendons. In addition to this it also affects small blood vessels which leads to bleeding‚ bruising and pain. Causes- A severe muscle strain occurs
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Muscular Dystrophy: any of a group of hereditary diseases marked by progressive wasting of certain "muscles." (Oxford) A general term for a group of inherited disorders which are characterized by progressive degeneration of skeletal muscles. A group of inherited progressive muscle disorders characterized by muscle weakness and eventual death of the muscle tissues. Examples include “Duchenne muscular dystrophy” and “Becker’s muscular dystrophy.” (NCIt) All of the muscles may be affected. Or‚ only
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1) THE MUSCULAR SYSTEM 3.1 INTRODUCTION OF MUSCULAR SYSTEM. Muscles tissue do is done by the coordinated contraction and release of millions of sarcomeres‚ tiny structures within the muscles cells. Muscle activity accounts for the most of the body’s energy consumption. All muscles tissues is strong. Most is enduring‚ some of it astoundingly so. Its cells are crowded with mitochondria‚ thousands of little factories constantly turning out molecules of ATP‚ a refined fuel. There are three types of
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Lab 6 Biomechanics of Frog Skeletal Muscle I. Purpose This exercise is designed to demonstrate some mechanical and physiological properties of skeletal muscle using the gastrocnemius muscle of a frog. II. Performance Objectives At the end of this exercise the student should be able to: 1. Define minimal (threshold)‚ subminimal‚ maximal‚ and supramaximal stimulus. 2. Explain what is meant by a “graded” response. 3. Draw a diagram of the setup used in this lab exercise. 4. Calculate the
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Introduction Jan Swammerdam‚ who demonstrated that an isolated frog muscle could be made to contract when the sciatic nerve was irritated with a metal object‚ conducted the first muscle experiments between 1661 and 1665. Later‚ between 1737-1798 Luigi Galvani determined that frog muscle responded to electrical currents. The kymograph‚ which was invented in the late 1840’s lead to the revolution of experimental physiology because it enabled muscle contractions to be analyzed and recorded. The muscle
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BI309 Lab-2 Name of student: Anisa Dreunibakarua ID #: S11033198 Title: Effect of Temperature and Stimuli on Simple Muscle Twitch. Introduction: Skeletal muscle is a type of striated muscle that is attached to skeleton to facilitate movement by applying force to bones and joints through contraction. Skeletal muscle generally contract voluntarily when stimulated by the nerve‚ although they can also contract involuntarily at times. Muscle action is controlled by the Nervous System
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Determining the Latent Period 1. Click Clear Tracings to erase the oscilloscope display. The voltage should be set to 5.0 volts. 2. Drag the 200 msec button to the right edge of the oscilloscope. 3. Click the Stimulate button once‚ and allow the tracing to complete. 4. When you measure the length of the latent period from a printed graph‚ you measure the time between the application of the stimulus and the beginning of the first observable response(increase in force). The computer can’t “look ahead
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We have more than 600 muscles in our bodies. They pump blood throughout your body‚ and help you lift heavy things like backpacks‚ and textbooks. You could control some of your muscles‚ while others like your heart‚ have their own jobs without us thinking at all. Muscles are all made up of same material. A type of tissue like the material in a rubber band. Thousands or tens of thousands of small fibers make up all or each muscle in our body. There are different muscles‚ fibers‚ and contractions.
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1. The muscle name "rectus abdominus" can be translated to mean... A) straight near abdomen B) surrounding the abdomen C) covering the abdomen at an angle D) connecting the abdomen to the clavicle Points Earned: 1.0/1.0 Correct Answer(s): A 2. When the muscle cell contracts‚ the insertion site typically A) does not move. B) moves. C) remains still Points Earned: 1.0/1.0 Correct Answer(s): B 3. A muscle that causes a major movement is a(n) A) prime mover or gonist
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