muscle twitch: contraction of small muscle units by impulses in the neurons supplying it electrical stimulus: an electrical current used to cause a single muscle or a group of muscles to contract latent period: delay between recieving a stimulus and the response 2. What is the role of acetylcholine in a skeletal muscle contraction? Your answer: Ach is the chemical signal used to send to the muslce to cause contraction. 3. Describe the process of excitation-contraction coupling in skeletal muscle
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Complete the chart of participants of the sliding filament theory: Number the statements in the proper sequence to describe excitation-contraction coupling. Step 1 has been numbered for you. ___1____ 1. Acetylcholine is released by the axon terminal‚ diffuses to the muscle cell and attaches To ACh receptors on the sarcolemma. ________ 2. The action potential‚ carried into the cell via the T-tubules‚ causes the SR to release Calcium ions. ________ 3. Ach-E breaks down
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Muscle Contraction Lab Report Pre-lab Quiz 1. Skeletal muscle fibers are innervated (stimulated) by c. motor neurons. 2. A single action potential propagating down a motor axon results in d. a single action potential and a single contractile event in the muscle fibers it innervates. 3. In resting skeletal muscle‚ calcium is stored in c. the sarcoplasmic reticulum. 4. During the latent period for an isometric contraction c. the cellular events involved in excitation-contraction coupling
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plate. Skeletal Muscle Twitch: A period of excitation-contraction in which electrical pulses trigger action potentials‚ The twitch is the result of a mechanical response to a single action potential. Electrical Stimulus: An isolated stimulus that sends energy through a muscle in which a response occurs. The stimulus generates movement in the muscle and causes the muscle to generate contractions. Latent Period: The beginning stage of muscle contractions. This stage produces no muscle force‚ but
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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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