Excitation Contraction Coupling Process The sequence of events that converts action potentials in a muscle fiber to a contraction is know as excitation contraction coupling. In order for a skeletal muscle fiber to contract‚ it has to get a signal from the nervous system. The part of the nervous system that it gets a signal from is called a motor neuron. An electoral signal‚ called an action potential travels down the axon and to the axon terminal. At the end of the motor neuron are structures
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Muscle Contraction & Excitation Muscle excitation takes place when there is a synaptic transmission and induction of an impulse. There are six steps that take place during muscle excitation. (1)The action potential travels down the somatic motor neuron axon reaching the synaptic bulb causing calcium ions to flow into the synaptic bulb. (2)The increase of calcium in the synaptic bulb causes the synaptic vesicles to undergo exocytosis. (Exocytosis a process that allows large molecule to leave
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Outline the differences between the excitation-contraction coupling mechanism between skeletal and cardiac muscles. Excitation-contraction coupling is the combination of the electrical and mechanical events in the muscle fibres and is related by the 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
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During a Muscle Contraction The muscle fiber is in a resting state. The resting state is slightly negative inside and slightly positive outside. It has to be in this state in order to receive a message. First the brain sends a message to the muscle using a neuron then reaches the axon terminal of the neuron. Calcium gates then open on the axon terminal allowing calcium to rush in. Ach release from axon terminals‚ diffuses across the synaptic clef and binds to (receptors) on motor end plate. Then
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Couplings are mechanical elements that ‘couples’ two drive elements which enables motion to be transferred from one element to another. The drive elements are normally shafts. We tend to see lot of applications of the couplings mainly in the automobiles‚ for example the drive shaft which connects the engine and the rear axle in a bus or any automobile is connected by means of a universal joint. In order to transmit torque between two shafts that either tend to lie in the same line or slightly misaligned
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Couplings A coupling is a mechanical device used to connect two rotating shafts for the purpose of transmitting torque from the driver to the driven piece of rotating equipment. There are two basic classes of industrial couplings: rigid and flexible. Rigid couplings are not designed to allow for any misalignment. Flexible couplings can compensate for some misalignment. Flexible couplings also allow for shaft end-float‚ or end-play‚ which is the inclination of shafts to move back and forth across
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(part 4 of 6) 10.0 points What is its frequency? Correct answer: 6.1216 Hz. 001 (part 1 of 6) 10.0 points A spring with a spring constant of 50.3 N/m is attached to different masses‚ and the system is set in motion. What is its period for a mass of 2.8 kg? 1 = 6.1216 Hz . 0.163356 s f2 = 005 (part 5 of 6) 10.0 points What is the period for a mass of 0.65 kg? Correct answer: 1.48243 s. Explanation: Let : Explanation: Correct answer: 0.714254 s. k = 50.3 N/m m1 = 2.8 kg
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STEPS IN SELECTION PROCESS: 1. Preliminary reception of Applications: The applications are the starting point of the selection process. Where application forms i.e.‚ application blanks are used the data can become a part of the employee’s record is hired. Further it provides factual information needed for evaluating the candidate’s suitability. 2. Preliminary Interview—Preliminary or initial interview is often held in case of "at the gate" candidates. This interview is usually of a short duration
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Steps in the Counseling Process 1. Establish a safe‚ trusting environment 2. CLARIFY: Help the person put their concern into words. 3. Active listening: find out the client’s agenda a) paraphrase‚ summarize‚ reflect‚ interpret b) focus on feelings‚ not events 4. Transform problem statements into goal statements. 5. Explore possible approaches to goal 6. Help person choose one way towards goal DEVELOP A PLAN (may involve several steps) 7. Make a contract to fulfill the plan (or to take the
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Step 6: Once the drilling gets about 500 feet above the shale formation‚ a downhole drilling motor with sophisticated measuring instruments begins the angle drilling creating a new horizontal path into the shale formation. Step 6: Once the drilling gets about 500 feet above the shale formation‚ a downhole drilling motor with sophisticated measuring instruments begins the angle drilling creating a new horizontal path into the shale formation. Step 4: The cement and casing are then pressure tested
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