REPORT Activity 2: Twitch Contractions and Summation PREDICTIONS Effect of Muscle Fiber Length on Contraction 1. As muscle fiber length increases: contraction force increases‚ becoming maximum at an optimal length‚ then decreasing at longer lengths. Effect of Stimulation Frequency on Contraction 2. As the frequency of stimulation increases‚ the force of contraction: increases. MATERIALS AND METHODS Measurement of Threshold Stimulus 1. Dependent Variable: contraction force. 2. Independent
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Theme: Energy Learning Area: 2. Heat Learning Objective: 2.4 Applying the principles of expansion and contraction of matter Learning Outcome: A student is able to: • Apply principle of expansion and contraction of matter in solving simple problems Materials: Activity sheets 1 – 5. (provided to the groups during the previous class)‚mahjong papers and marker pens‚ LCD projector Teacher: Good morning boys and girls. What have you learnt yesterday? Teacher waits and listens to students’
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Chapter 9: Muscles and Muscle Tissue‚ Lecture Outline: I. Overview of Muscle Tissues (pp. 276–278; Table 9.1) A. Types of Muscle Tissue (p. 277; Table 9.1) 1. Skeletal muscle is associated with the bony skeleton and consists of large cells that bear striations and are under voluntary control. 2. Cardiac muscle occurs only in the heart and consists of small cells that are striated and under involuntary control. 3. Smooth muscle is found in the walls of hollow organs and
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Introduction Contractions of the uterus can occur throughout pregnancy. Contractions are not always a sign that you are in labor. Contractions that occur before labor are called Braxton Hicks contractions‚ or false labor. These contractions are sometimes confused with true labor. What are Braxton Hicks contractions? Braxton Hicks contractions are contractions of the uterus that occur before labor. Toward the end of pregnancy (32–34 weeks)‚ Braxton Hicks contractions can develop more often and may
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oscilloscope. Enter the number of ventricular contractions per minute (from the heart rate display) in the field below and then click Submit Data to record your answer in the lab report. You answered: 62 beats/min Which of the following statements about the contractile activity is true? You did not answer this question. Correct answer: a. The smaller waves represent the contraction of the atria. During which portion of the cardiac muscle contraction is it possible to induce an extrasystole? You correctly
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Premature Atrial Contraction A premature atrial contraction (PAC) is a kind of irregular heartbeat (arrhythmia). It happens when the heart beats too early and then pauses before beating again. PACs are also called skipped heartbeats because they may make you feel like your heart is stopping for a second. CAUSES Your heart has four chambers. Normally electrical signals spread across your heart and make all the chambers beat together. During a PAC‚ the upper chambers of the heart (atria) beat too
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Muscle Fiber contractions for our purposes begins with the arrival of action potential (action potential- is an electrical current) at the end of the axon terminal (axon terminal- the swollen distal end of the motor neuron axon). When the action potential reaches the axon terminal the action potential causes the voltage- gated calcium ion channels to open allowing calcium to flow in from extracellular fluid. The presence of calcium in the axon terminal causes synaptic vesicles (synaptic vesicles-
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Muscle contractions and stimulations play a very integral part in the functioning of an organism and muscles are especially function for force production and motion all this is highly influenced by specific temperatures‚ electrical impulses‚ proteins and enzymes and other factors that occur whether on the inside or the external environment of an organism (Amitrano & Tortora‚ 2012). Proteins as defined by Cheeke 2010‚ are molecules that are made up of amino acids and are responsible for almost all
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A Coupling Analysis of the Biomechanical Functions of Human Foot Complex during Locomotion Zhihui Qian1‚ Lei Ren2‚ Luquan Ren1 1. Key Laboratory of Bionic Engineering‚ Jilin University‚ Changchun 130022‚ P. R. China 2. School of Mechanical‚ Aerospace and Civil Engineering‚ University of Manchester‚ Manchester M60 1QD‚ UK Abstract This study represents a functional analysis of the human foot complex based on in-vivo gait measurements‚ finite element (FE) modeling and biological coupling theory
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The Comparison and Contraction Between Various Skin Cells By: Michael McDaniel‚ Latoya Gates‚ Cristy Barfield‚ and Danielle Chapelle Abstract During this experiment we planned to compare and contrast human cheek cells of a variety of age groups‚ different stages of skin‚ and difference in species. We wanted to see if age could correlate to cell structure and size‚ if animal and human cells differed and if epidermal and cheek cells could differ in shape‚ size‚ and color. The age groups that
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