relaxation during surgery and to facilitate the insertion of the endotracheal tube. Following this‚ the inhalation anesthetic was administered and the surgical procedure completed. 1. Beginning with an impulse from a motor neuron at the neuromuscular junction‚ describe the normal sequence of events which lead to muscle
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muscle) Have a rise in intracellular Ca2+ level; the final trigger for contraction Linking the electoral signal to the contraction is excitation-contraction coupling Very tightly coupled In muscle its usually all or nothing Neuromuscular junction Each muscle has a motor neuron that innervates Attaches to muscle fibers via external branching Some activate more than others based on the motor fineness needed for the activity Nervous input (action potential) comes down the muscle fiber to
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Muscular System Animations 1. How do nerve impulses cause muscle contraction? Skeletal muscle is under voluntary control. Nerve impulses that originate in the central nervous system cause muscles to contract. Both neurons and muscle tissue conduct electrical current by moving ions across cellular membranes. A motor neuron ends in a synapse with a muscle fiber. The neuron releases acetylcholine and transfers the action potential to the muscle tissue. The signal will travel through the tissue
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com/Medicalstudycenter2012 ed ic al St ud y C Q.2: a). Draw and label the neuromuscular junction. 2 marks b). What is end plate potential? How is it produced? How is it affected in myasthenia gravis? (2004‚ 2008 UHS). 1+1+1 marks M END PLATE POTENTIAL: It is a local potential of motor end plate‚ i-e.‚ the thickened muscle membrane that is supplied by a motor-neuron‚ thus forming a component of neuro-muscular junction. Production
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attaches to the receptors in the motor-end plate and creates the beginning process of triggering muscle contractions. 3. Describe .the process of excitation-contraction coupling in skeletal muscle fibers.The motor unit meets at the neuromusclular junction‚ where the axon terminal of a neuron and muscle fiber’s plasma membrane meet‚ also called the motor
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ELECTROMYOGRAPHY (EMG) Roshna S Department of Electronics and Communication‚ 8th SEM CMR Institute of Technology AECS layout‚ ITPL road‚ Bangalore‚ India Abstract – Electromyography (EMG) is a diagnostic procedure to assess the health of muscles and the nerve cells that control them (motor neurons). Motor neurons transmit electrical signals that cause muscles to contract. An EMG translates these signals into graphs‚ sounds or numerical values that a specialist interprets. It is a technique for
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Exercise 2: Skeletal Muscle Physiology: Activity 1: The Muscle Twitch and the Latent Period Lab Report Pre-lab Quiz Results You have not completed the Pre-lab Quiz. 03/21/15 page 1 Experiment Results Predict Question: Predict Question: Will changes to the stimulus voltage alter the duration of the latent period? Your answer : b. No‚ changing the stimulus voltage will not change the latent period duration. Stop & Think Questions: What is the period of time that elapses between the generation of
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release of calcium from the sarcoplasmic reticulum. (Silverthorn‚ 2007) In the skeletal muscle‚ action potential in the nerves is generated when the somatic motor neurons releases the neurotransmitter acetylcholine (ACh)‚ at the neuromuscular junction. This initiates muscle action potential which is then transmitted to the t-tubules. Action potential in the t-tubules leads to the release of calcium in the sarcoplasmic reticulum triggering muscle contraction. In the cardiac muscles
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___myosin_______________________. 3. What is a motor unit? Functional unit composed of a single motor neuron with the muscle cells it innervates 4. Name and describe the parts of a neuromuscular junction. Motor neurons connect to the sarcolemma of a muscle fiber at a folded motor end plate forming a neuromuscular junction. 5. What do acetylcholine and cholinesterase do? Ach initiates an electrical impulse in the sarcolemma and cholinesterase degrades Ach after it diffuse away from its receptor on the motor
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where the flattened end of a motor neuron transmits neural impulses to a muscle is the motor end-plate. The end plate potentials depolarizes skeletal muscle fibers caused by neurotransmitters binding to the postsynaptic membrane in the neuromuscular junction. The process of contraction of the muscle cell is called excitation-contraction coupling. In this experiment‚ when we used a single electrical stimulus‚ it resulted in a muscle twitch with three phases: latent period‚ contraction phase‚ and the relaxation
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