neurons and muscle fibers are the building blocks of motor units and where they intersect is called the neuromuscular junciton. The region 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
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of the 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
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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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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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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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process of excitation-contraction coupling in skeletal muscle fibers is that the end plate potential triggers a series of events that results in the contraction of a muscle cell. End plate potential is caused by the events that occur at the neuromuscular junction. 3. Describe the three phases of a skeletal muscle twitch. The first phase is the latent period- this is the period of time that elapses between the generations of an action potential in a muscle cell. The second phase is the contraction
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Section I – Multiple choice: (65 points; 2.5 points each). Bubble your answers on your scantron. 1. A motor unit refers to a. a single muscle fiber plus all of the motor neurons that innervate it b. all of the motor neurons supplying a single muscle c. *a single motor neuron plus all the muscle fibers it innervates d. a pair of antagonistic muscles e. all of the muscles that affect the movement of any given joint 2. Which of the following is NOT associated with the thin filaments
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Neuromuscular blocking drugs were first used by South American Indians on their arrows to paralyze their prey. During that time neuromuscular drugs were called curare. They were first written about in a letter by a chronicler‚ employed by the Court of King Ferdinand and Queen Isabella‚ in 1516. In the 18th century Edward Bancroft‚ a physician‚ brought samples of curare back from South America and Sir Benjamin Brodie showed how small animals could be left alive after being injected with curare and
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one skeletal muscle. Correct answer: c. one motor neuron and all of the skeletal muscle fibers it innervates. 4. The motor neuron and muscle fiber intersect at what is called Your answer : b. the inhibitory synapse. Correct answer: d. the neuromuscular junction. 5. A twitch is You correctly answered: a. one contractile response to a single action potential. 010/17/12 page 1 Experiment Results Predict Question: Predict Question: Will changes to the stimulus voltage alter the duration of
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The Tired Swimmer Case Two BIO: 201-104 November 11‚ 2010 Part I: Meet Annie 1. What vital signs or symptoms does Annie exhibit? a. Blurred vision and eye strain b. Hands ache and feel weak c. Gasping for air d. Weakness & Constant fatigue 2. Can you see any common features in Annie’s signs and symptoms? With blurred vision and eyestrain we must look at the optic nerve within the brain. From there‚ what could be causing the difficulty breathing and weakness
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