of exercise Hypertrophy- muscles can increase in size (growth) with an increase in activity Muscles fibre arrangement Fusiform muscles Fusiform muscles run the length of the muscle belly. They are designed for mobility because they produce contractions over a large range‚ yet they produce low force (eg. Sartorius and biceps) Pennate muscles Pennate muscles run at angles to the tendons. These muscles are designed for strength and power. Unipennate muscles- found on one side of a central
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Skeletal Muscle Physiology Student instructions: Follow the step-by-step instructions for this exercise found in your lab manual and record your answers in the spaces below. Submit this completed document by the assignment due date found in the Syllabus. Rename this document to include your first and last name prior to submitting‚ e.g. Exercise2_JohnSmith.doc. Please make sure that your answers are typed in RED. (You may delete these instructions before submission.) Grading: True/False
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physioex 9.0 Purpose Does the duration of the latent period change with different stimulus voltage? What is the role of acetylcholine in a skeletal muscle contraction? Hypothesis I predict that the latent period will not change if the stimulant is increased or decreased. Materials Human Anatomy &Physiology Marieb/Hoehn PhysioEx™ Lab: Skeletal Muscle Physiology Results/Ananlysis EXERCISE 2 Skeletal Muscle Physiology Name Valerie Jordan_ Lab Time/Date ___ Activity
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Heads Actin Flexible Hinge Region Tropomyosin (covers head) MOTOR UNIT - single alpha motor neuron + muscle fibers that it innervate - FINE: alpha motor neuron innervates FEW muscle fibers; GROSS: MANY muscle fibers Muscle Depolarization and Contraction 1. Neuromuscular Junction 2. Release of ACh (Acetylcholine) molecules 3. Binding of ACh to receptor opens up Na/K 4. Concentration Gradient (K OUT‚ NA IN) 5. Depolarization of Sarcolemma 6. Action Potential down the T-Tubule 7. Sarcoplasmic Reticulum
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designed to build strength as follows:- a) Active Exercises - This is where there is a voluntary effort by an individual to construct the muscles. Active exercises may be isotonic or isometric. With the former‚ the muscle fibres shorten and cause movement at a joint‚ thus enabling a part of the body to be moved. In isometric exercises‚ the movement does not occur because the muscle tension is increased but the fibres don’t shorten. b) Passive Exercises - These are carried out by the individual
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Today there is an implausible range of physical activities on offer‚ from the commercially motivated activities that are enjoyable and challenging‚ such as indoor rock climbing‚ to the more traditional exercise types. The challenge for the individual is to find an exercise type that meets their fitness needs and that is enjoyable. Many individual fitness activities are available‚ some which require specific knowledge and skills. Raised awareness of health has led to the stimulation of many fitness
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athletic position or “start phase”‚ next the jumping motion or “active phase” and finally will be the landing known as the “ending phase”. I will be describing every motion‚ as well as what plane the muscles are moving in and whether the movement is isometric‚ concentric or eccentric. Starting in athletic position‚ or the ‘start phase’‚ ankles are slightly dorsiflexed‚ knees flexed slightly‚ hips are flexed‚ and both the lumbar and cervical spine are extended. Shoulders are abducted at a ninety degree
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Physiology Chooljian Lecture Exam #3 Review FIRST: Be sure to: Study chapter objectives‚ summaries‚ and reviews Review your lecture notes ANS Define: denervation hypersensitivity‚ ganglia‚ mass activation‚ sympathoadrenal system‚ dual innervation. What are the two divisions of the ANS? Where are the neurons for each division located‚ and what is the major function of each division? What type of neurons (sensory or motor) are in the ANS? What are the names for the two
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EXERCISE 2: Skeletal Muscle Physiology Student Name: Student ID#: Student instructions: Follow the step-by-step instructions for this exercise found in your lab manual and record your answers in the spaces below. Submit this completed document by the assignment due date found in the Syllabus. Rename this document to include your first and last name prior to submitting‚ e.g. Exercise2_JohnSmith.doc. Please make sure that your answers are typed in RED. (You may delete these instructions
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twitch- a brief contraction of all the muscle fibers in a motor unit in response to a single action potential in its motor neuron. A twitch has three phases. Latent‚ contraction‚ and relaxation phase Electrical stimulus- used to control muscle contractions Latent period- the period of time that elapses between the generation of an action potential in a muscle cell and the start of a muscle contraction 5. What is the role of acetylcholine (ACh) in a skeletal muscle contraction? Acetylcholine
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