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 (sarcolemma.) The threshold is the point at which sodium ions start to move into the cell (instead of out of
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fiber‚ Ca2+ is stored within the sarcoplasmic reticulum The bundle of dense regular connective tissue that attaches a skeletal muscle to bone is called a(n) tendon. In excitation-contraction coupling‚ the transverse tubules function to conduct an action potential into the sarcoplasmic reticulum. During muscle contraction‚ the I band shortens or narrows What event causes troponin to regain its original shape in muscle relaxation? return of Ca2+ into the sarcoplasmic reticulum A
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acetylcholine in a skeletal muscle contraction? Skeletal muscle fiber-Skeletal muscle fibers are the individual cells that are bound together in fascicles. Many fascicles are bound together to make a muscle Motor unit-A motor unit consists of a motor neuron and all of the muscle fibers in innervates. Skeletal muscle twitch-A skeletal muscle twitch is a mechanical response to a single action potential. Electrical stimulus- used to mimic the contractions of skeletal muscles Latent period-Latent
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CV 1 Topical Organization of the Cardiovascular Lectures 1. 2. 3. Function & Anatomy Heart & Vascular System – Chapter 9 Cardiac Electrophysiology – Chapter 9 Hemodynamics – Static & Dynamic Hemodynamic Properties – Chapter 10 Cardiac Mechanics – Chapter 9 Cardiac Output – Chapter 9 Peripheral Vascular System – Chapter 10 Regulation of Blood Pressure – Chapter 10 4. 5. 6. 7. June 19‚ 2013 1 CV 2 Topic #1: Functions & Anatomy of the CV System Chapter 9 Functions 1. Delivery
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concentration of calcium ions into the cell. Calcium ions play a key role in activating what is known as the contractile machinery – the actin and myosin filaments. The cardiac action potential‚ unlike other forms of muscular contraction‚ will last roughly as long contraction. This is shown below‚ depolarisation is followed by an unusual plateau‚ and the cardiac action potential can be split into five main phases. Cardiomyocytes are also electrically coupled – so they all contract and relax in unison
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Muscle Tissue R UNIT 10 S 8 7 Excitation-contraction coupling refers to a. the muscle fiber’s depolarization. b. the relationship between length of the sarcomere and the tension generated. c. the sliding of thick and thin filaments past one another. d. the relationship between excitation at the sarcolemma and release of calcium ions from the sarcoplasmic reticulum. 8 Number the following events of skeletal muscle contraction in the proper order‚ with number 1 for the first
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Physiology Chooljian Lecture Exam #3 Review FIRST: Be sure to: Study chapter objectives‚ summaries‚ and reviews Review your lecture notes ANS Define: denervation hypersensitivity‚ ganglia‚ mass activation‚ sympathoadrenal system‚ dual innervation. What are the two divisions of the ANS? Where are the neurons for each division located‚ and what is the major function of each division? What type of neurons (sensory or motor) are in the ANS? What are the names for the two
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MANY PROCESSES MUST TAKE place within the skeletal muscle fibres in order for muscle contraction to occur. The cross bridge cycle‚ process by which the muscle length is shortened as myosin heads‚ extending from the myosin filaments‚ interact cyclically in a rowing motion with the actin filament (Rayment et al. 1993)‚ is one of the crucial mechanical events required. The mechanism is initiated when an ATP molecule is bound to a myosin head. An enzyme within the head. known as ATPase‚ hydrolyzes the
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Skeletal Muscle Physiology Student instructions: Follow the step-by-step instructions for this exercise found in your lab manual and record your answers in the spaces below. Submit this completed document by the assignment due date found in the Syllabus. Rename this document to include your first and last name prior to submitting‚ e.g. Exercise2_JohnSmith.doc. Please make sure that your answers are typed in RED. (You may delete these instructions before submission.) Grading: True/False
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defective receptor is responsible for a disruption of calcium ion regulation by accumulating calcium in the skeletal muscles‚ leading to hypermetabolsim.2 This overabundance of released calcium leads to continual muscle contraction in a form of rigidity.7 Continuous muscle contraction requires huge amounts of adenosine triphosphate‚ leading to adenosine triphosphate depletion; then
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