Introduction to Myasthenia Gravis Myasthenia Gravis‚ also Known as "grave muscle weakness" is a chronic muscle disease that causes abnormally rapid fatigue of the skeletal muscle system‚ which are the voluntary muscles. The affected muscles tire quickly but regain strength after a period of rest. Myasthenia Gravis is termed an autoimmune disease. The immune system usually makes antibodies to attack bacteria‚ viruses and germs. With the autoimmune disease‚ the immune system makes antibodies
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Nitrogen in the air enters and leaves living systems by way of the nitrogen cycle. Describe the events which take place when atmospheric nitrogen molecules move along a food chain (involving legumes and herbivorous mammals) and eventually return to the atmosphere. In your answer‚ describe the uptake‚ processing and utilization of nitrogen in the bodies of these organisms Atmospheric nitrogen in air enters by diffusion or gaseous exchange and leaves the bodies of most organisms without biotransformation
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Bio-111 Laboratory #8 Mitosis and Meiosis 17 November 2010 Part1-Questions: a) Explain mitosis Mitosis is a process of asexual reproduction in eukaryotic cells. This process is divided into five stages: prophase‚ metaphase‚ anaphase‚ telophase and cytokinesis. A diploid cell duplicates its genetic information. Therefore the two diploid daughter cells will receive an exact copy of the genetic material. Explain meiosis Meiosis is a two round cell division process where a diploid cell divides
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Biology Unit 2 Module 2 1.1: Explain the uptake of ions by active transport in roots; * Emphasize the role of the endodermis. Most plants secure the water and minerals they need from their roots. The path taken is: soil -> roots -> stems -> leaves The minerals (e.g.‚ K+‚ Ca2+) travel dissolved in the water (often accompanied by various organic molecules supplied by root cells).Less than 1% of the water reaching the leaves is used in photosynthesis and plant growth. Most of it is
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The Neuromuscular Junction by: Dominique Latham 651 words A neuromuscular junction is a place in the body where the axons of motor nerves meet the muscle‚ thus transmitting messages from the brain which cause the muscle to contract and relax. Every organism has thousands of neuromuscular joints which are the locations and means by which the motor neuron of the nervous system that instructs the muscle cells of the muscular systems to take action. Action that ‚ in turn lead to movements of muscles
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experienced by each muscle fiber due to the extra blood load entering the heart. The stretching of the muscle fibers augments cardiac muscle contraction by increasing the affinity of troponin C for calcium[citation needed]‚ causing a greater number of actin-myosin cross-bridges to form within the muscle fibers. The force that any single cardiac muscle fiber generates is proportional to the initial sarcomere length (known as preload)‚ and the stretch on the individual fibers is related to the End Diastolic
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Exercise 2: Skeletal Muscle Physiology: Activity 6: The Skeletal Muscle Length-Tension Relationship Lab Report Pre-lab Quiz Results You have not completed the Pre-lab Quiz. 07/08/13 page 1 Experiment Results Predict Question: Predict Question: As the resting length of the muscle is changed‚ what will happen to the amount of total force the muscle generates during the stimulated twitch? Your answer : d. An increase in muscle length will decrease the total force. Stop & Think Questions: Note
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Exam 3 Review Sheet Genetics terms: phenotype‚ genotype‚ allele‚ dominant‚ recessive‚ homozygous‚ heterozygous‚ multiple alleles‚ codominance Phenotype: physical appearance Genotype: genetic composition Allele: alternate form of a gene Dominant: trait that will be expressed Recessive: trait that will be masked by dominant trait Homozygous: both alleles are the same Heterozygous: the alleles are different Multiple Alleles: Codominance: Sex determination – all possibilities Xyy: Xxy
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Name: Cassidy Lessig Activity 1 The Muscle Twitch and the Latent Period 1. 1. Define the terms skeletal muscle fiber‚ motor unit‚ skeletal muscle twitch‚ electrical stimulus‚ and latent period 2. What .is the role of acetylcholine in a skeletal muscle contraction? Skeletal muscle fiber-Skeletal muscle fibers are the individual cells that are bound together in fascicles. Many fascicles are bound together to make a muscle Motor unit-A motor unit consists of a motor neuron and all of the muscle
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motor unit is a motor neuron and all the muscle cells that it innervates and causes to contract. –TRUE When a sarcomere contracts‚ the myosin filaments slide over the actin filaments bringing the myosin filaments closer together. –FALSE During muscle contraction‚ when calcium ions bind to TROPONIN‚ the binding site on actin filaments is uncovered. The insertion of a muscle is that end which during the contraction‚ stays relatively motionless. –FALSE Chapter 13: Nervous System The neuron
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