have the strength and the control needed for efficient heart action. 4‚ Explain the mechanism for muscle contraction. The sliding filament model of muscle explains how muscle contraction occurs. Muscle fibers made of thick fibers called myosin and thin filaments called actin form a bridge. Using energy from cellular respiration‚ the filaments shorten and the fibers pull closer together. The bridge then releases and connects again to a filament to contract again. This cycle repeats and
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of muscles fibers called fascicles. These fascicles are composed of many individual muscle fibers or muscle cells that can be up to several millimeters long. These muscle fibers are composed of myofibrils‚ which are organized into thick filaments‚ myosin‚ and thin filaments‚ actin. These filaments are organized into repeating structures called sarcomeres‚ which are the subunits of skeletal muscle. In order to generate force‚ these filaments must slide past one another (Widmaier 2011). Muscle fibers
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tissue is made up of smaller fibers called myofibrils. These myofibrils are composed of even smaller protein filaments. These filaments can be either thick or thin. The thick filaments are made of the protein myosin‚ and the thin filaments are made of the protein actin. The arrangement of the myosin and actin gives skeletal muscle its striated (or striped) appearance. Each section of a myofibril is called a sarcomere‚ and is the functional unit of muscle. How muscles contract is directly related
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hysioEx 9.0 – Exercise 2: Skeletal Muscle Physiology Name: Chart 1: Latent Period Results Voltage Active force (g) Latent period (msec) 0.0 0.00 XXXXXXXXXX 3.0 1.04 XXXXXXXXXX 4.0 1.32 2.40 6.0 1.65 2.40 8.0 1.81 2.40 10.0 1.81 2.40 Chart 2: Effect of Stimulus Voltage on Skeletal Muscle Contraction Voltage Active force (g) 0.0 0.00 0.2 0.00 0.8 0.02 1.0 .15 1.5 .43 2.0 .66 2.5 .87 3.0 1.64 3.5 1.19 4.0 1.32 4.5 1.42 5.0 1.51 5.5 1.59 6.0 1.65 6.5 1.70 7.0 1.74 7
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active force increases. With each force (a&p) the total force is changed depending on the amount of either A or P forces. 38. Based on the unique arrangement of myosin and actin in skeletal muscle sarcomeres‚ explain why active force varies with changes in the muscle’s resting length. Active force is generated from myosin thick filaments bind to thin actin filaments‚ engaging the cross bridge cycle and ATP hydrolysis. Active force data changes as the resting length of the muscle changes
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sarcolemma—carries action potential 3. Triad __1__ part of sarcoplasmic reticulum—stores calcium ions 7. Myofibrils consist of contractile proteins called myofilaments. Name the two types and what they’re composed of: Thick filaments composed of myosin (red) Thin filaments composed of actin (blue) 8. Arrangement of myofilaments. Give the letter name of each band: Dark band __A__ band Light band __I__ band Match two definitions with each band: __I__ contains only thin filaments __A__
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318). A microtubule‚ which is made of proteins located in cytoskeleton‚ is one of three filaments that is long‚ hollow stiff tube and responsible for intracellular transport. This transport system is driven by kinesin and dynein in microtubules and myosin in actin filaments‚ which are called motor proteins. (Gross‚ Tuma‚ Deacon‚ Serpinskaya‚ Reilein‚ & Gelfand‚ 2002‚ p. 855). To understand how those movements along microtubules can make the rapid colour change possible‚ it is necessary first to find
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The Muscular System: Skeletal Muscle Tissue 1. Fill in the characteristics of the three muscle types: Muscle Type Cardiac Skeletal Smooth Shape of cell Y shaped and are shorter and wider than skeletal muscle cells Single‚ very long cylindrica Single‚ spindle shaped cells # of nuclei 1 or 2 multi 1 Striations yes yes no Control The heart The movement of the body The intestines like the small and large 2. What attaches muscles to bone? ______Tendon_______________. 3. The whole
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of one assignment from 3 media categories. Video and Documents (5 points each) complete resource record ● The Skeletal System Bozeman Biology ● The Skeletal System: It’s ALIVE! CrashCourse Biology #30 ● The Muscular System Bozeman Biology ● Myosin and Actin Khan Academy ● Tropomyosin and troponin and their role in regulating muscle contraction Khan Academy ● Anatomy of a Muscle Cell Khan Academy ● Big Guns: The Muscular System CrashCourse Biology #31 ● Levels of Organization
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NPB 101L Final Exam Review Lab 2 – Skeletal Muscle 1. Describe basic setup a. What was manipulated? Intensity‚ frequency b. What was measured? Twitch tensions c. What concepts were investigated? i. Frog‚ sciatic nerve‚ gastroc‚ d. What was investigated? i. Effects of stimulus frequency and intensity on contraction-the more intensity‚ the higher the twitch tension. The more freq- the more twitch tension (By ~4.0pps we start to see summation of the twitches and by ~15pps we see no single twitches
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