Exercise 2: Skeletal Muscle Physiology: Activity 3: The Effect of Stimulus Frequency on Skeletal Muscle Contraction Lab Report Pre-lab Quiz Results You scored 25% by answering 1 out of 4 questions correctly. 1. During a single twitch of a skeletal muscle Your answer : a. calcium is not released from the sarcoplasmic reticulum. Correct answer: b. maximal force is never achieved. 2. When a skeletal muscle is repetitively stimulated‚ twitches can overlap each other and result in a stronger muscle
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Nervous and Endocrine System Work Sheet View the following case studies on the Anatomy and Physiology place website: Chapter 7 –Nervous System; Chapter 8- Special Senses Chapter 9 – Endocrine Try to answer the questions in the case study and be sure to check the correct answers! However you will not need to submit your answers to these questions‚ only the questions on the worksheet ( see below). Submit your answers as a word document to the Week 4 dropbox 1. Define a reflex and list
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Laboratory Exercise # 2 Skeletal Muscle Mechanics 1. What is a skeletal muscle fiber? Present (and explain) a diagram that demonstrates the interaction between actin and myosin during contraction. What is the role of calcium‚ troponin‚ and tropomyosin? 2. Present the basic anatomy of a motor neuron input into skeletal muscle. How is each muscle fiber innervated? What is a motor unit? What are the advantages/disadvantages of large and small motor units? What kinds of
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Stimulus-Dependent Lab A motor unit is a motor neuron and the muscle fiber it controls. A whole muscle is made up of hundreds of motor units that are handled by different motor neurons that react at different levels of stimulation. The electric shock acts as an action potential by changing the membrane permeability allowing the sodium and potassium ions to pass through. At different levels of stimulation the motor neurons stimulate a motor unit and the more stimulation the more motor units become
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REVIEW SHEET EXERCISE 2 Skeletal Muscle Physiology NAME: Jasmine Young LAB TIME/DATE: 1. Define each of the 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
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Effects of Decerebration on Toad In Accordance to its Responses to Different Stimuli1 September _ 2013 ABSTRACT The brain is the most important part of an organism’s body. It is the one that receives all information from different stimuli and controls the movement of body parts. But for sudden stimuli that needs a quick response‚ spinal cord reflexes happened. The effect of decerebration on a toad (Bufo marinus) will cause its inability to move‚ but it still responded
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Depolarizing and nondepolarizing agents are both apart of the neuromuscular blockade group. Neuromuscular blockers work by impeding motor nerve impulses from passing to the skeletal muscles. The purpose of blocking these passes is to make the muscles weak or paralyzed in surgery. Neuromuscular blockers can be used in many surgical procedures‚ like inserting an endotracheal tube‚ by relaxing the jaw muscles. They are also useful for relaxing the diaphragm and intercostal muscles (responsible for respirations)
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Chapter 5 Describe tight junctions Consist of transmembrane cell-adheasion proteins around upper part of cell holding neighboring cells together. Identify the three types of muscle tissue * Cardiac * Smooth * Skeletal A muscle cell is also called a myocyte What type of tissues covers body surfaces‚ lines body cavities‚ forms the internal and external linings of many organs and constitutes most gland tissue? Epithelial By definition‚ adipose tissue is a type of connective tissue
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Tight junctions (TJs) are occluding junctions which act as barriers that control paracellular permeability and regulate trans-epithelial water and solute movement. The structures are composed of integral transmembrane proteins that link adjacent cells‚ with an effect on cell-cell adhesion and epithelial permeability. It also works as a boundary between the apical and basolateral plasma membrane domains to create the polarisation of endothelial and epithelial cells. These junctions are comprised of
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EQUATIONS FOR PREDICTING THE CAPACITY OF TURNING TRAFFIC STREAMS μba = D(627 + 14Wcr – Y(0.364qac + 0.144qab+ 0.229qca + 0.520qcb)) μbc = E(745 – Y( 0.364qac + 0.144qab ) μcb = F(745 – 0.364Y( qac + qab ) D = (1 + 0.094(wab – 3.65))(1 + 0.0009(Vrba – 120)) x (1 + 0.0006(Vlba – 150)) E = (1 + 0.094(wbc – 3.65))(1 + 0.0009(Vrbc – 120)) F = (1 + 0.094(wcb – 3.65))(1 + 0.0009(Vrcb – 120)) μ = stream capacity qab = measured flow of stream a-b qac = measured flow of stream a-c qca = measured
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