Lab Report Electrophoresis: Using Electricity to Separate Molecules Answer the following questions about the results of this activity. Record your answers in the boxes. Send your completed lab report to your instructor. Don’t forget to save your lab report to your computer! Activity 1 – Calibration Record your data from Activity 1 in the boxes below. Enter the data (number of bands‚ description of the band patterns) you collected for the protein ladder in the appropriate columns
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Laboratory – Muscle Physiology A. MUSCLE TONUS Observations‚ Report and Conclusion: A. Define muscle tonus and give its importance * Muscle tonus refers to a state of slight muscular contraction maintained by synchronous impulses of low frequency‚ discharged by the spinal motor neurons. * Reflex in nature. * Muscle tonus is a small amount of tension in the muscle due to weak‚ involuntary contractions of its motor units. Muscle tonus is important in a sense that it governs the
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Pig Trachealis Smooth Muscle Pharmomechanical coupling uses Internal Calcium stores whilst Electromechanical coupling uses Extracellular Calcium Crystal Nguyen School of Anatomy‚ Physiology and Human Biology‚ The University of Western Australia‚ WA‚ 6009 Introduction Smooth muscle contraction occurs when calcium is present in the smooth muscle cell and binds onto calmodulin to activate myosin light chain kinase (Wilson et al.‚ 2002). Phosphorylation of myosin light chains result in myosin
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Report The Aurelia aurita‚ also known as moon jellyfish‚ is a common species of jellyfish‚ which can be found in oceans around the world. They are hardy‚ and capable of living in acidic‚ polluted or poorly oxygenated water. Life Cycle of Moon jellyfish The polyps are the first stage of their life‚ hatching from eggs. The polyps undergo a process called strobilation‚ to enter the strobila stage‚ and then the juvenile stage‚ which are called ephyra. They then mature to enter the adult stage‚ known
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Muscle Tissue 1. How is muscle tissue categorized? Muscle tissue is categorized by its shape‚ the number of nuclei‚ and the mechanism of stimulation. 2. a. Click the Smooth Muscle Tissue. Identify each of the following: Nucleus----- Smooth Fiber Muscle------------------ b. Describe smooth muscle control (voluntary or involuntary). Involuntary c. Name some smooth muscle functions (click the “Tissue Locations” button). Smooth
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and its interactions with Cofilin in pathways leading to Synaptic Plasticity Abstract Cofilin is an actin depolymerization factor responsible for severance of actin filaments in dendritic spines. Cofilin is activated upon de-phosphorylation via slingshot phosphatase (SSH) and deactivated when phosphorylated by LIM-kinase (LIMK). Phosphorylation of Cofilin results in polymerization of F-actin therefore formation of dendritic spines which is associated with LTP. Peptide drugs S3 and p-S3 are known
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even smaller structures called actin which is a thin‚ contractile protein filament‚ containing ’active’ or ’binding’ sites and myosin filaments which are a thick‚ contractile protein filament‚ with Myosin Heads. These filaments slide in and out between each other to form a muscle contractions‚ this is why it is known as the sliding filament theory. Firstly I am going to explain how the filaments slide. In a relaxed muscle the cross bridges are detached from the actin filaments. When you muscle contracts
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pts. A maximum of 20 pts may be added to your first exam 20 x (correct pts / total pts) Question 1 Actin and tubulin form self-assembling polymers. Where on the filaments do subunits exchange with free monomers? Subunit exchange with free monomers occurs at the end of filaments. In actin filaments‚ subunits can be freely exchanged at both ends of the filament (pointed and barbed ends) until the actin formation reaches a steady state. At this point‚ the subunits are added to the barbed end and lost
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exposing the myosin binding sites on actin. This is the latent period‚ the lag time between stimulation and contraction. Myosin heads or cross bridges attach to actin binding sites on thin filaments. The sliding filament theory of a muscle contraction begins. When myosin binds to actin it pulls toward the m-line this is the “power stroke”. Once myosin head if flexed‚ ATP binding site is exposed and ATP binds to the head. Every single myosin head that attaches to actin has to have ATP. Now the myosin
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An actin myofilament is actually composed of what three different molecules? * Troponin - When Calcium binds to troponin‚ it changes shape‚ which moves tropomyosin away. This uncovers the actin binding site‚ which allows myosin to bind to actin and begin contraction. * Tropomyosin - Covers the myosin binding sites on actin. * G-actin 11. Myosin molecules make contact with actin via what structure? Cross-bridges - The chemical bond myosin molecule forms with the actin molecule
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