Name______________________ Lab Section ________________ Microscopic Anatomy and Organization of Skeletal Muscle and Muscle Physiology Lab 9 Skeleton Muscle Physiology: Computer Simulation Exercise 16B - Page PEx-23 Activity Sheet Objectives: • Use a simulation of skeletal muscle experiments to investigate threshold stimulus‚ maximal stimulus‚ multiple motor unit summation‚ wave summation and tetanus and the graded contraction
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between the application of the stimulus and the last point where the active force is zero (just prior to contraction). How long is the latent period? _2.78_ msec What occurs in the muscle during this apparent lack of activity? The muscle is reacting internally and getting the signals to contract. Investigating Graded Muscle Response to Increased Stimulus Intensity 1. Click Clear Tracings if there are tracings on your screen. 2. Set the voltage to 0.0‚ and click Stimulate. 3. Click Record Data. If you
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PHYSIOLOGICAL & MECHANICAL PROPERTIES OF SKELETAL MUSCLE USING FROG GASTROCNEMIUS AIM The purpose of this experiment was to demonstrate the physiological as well as mechanical properties of skeletal muscle using the gastrocnemius muscle of a frog by exploring five different investigations namely the single twitch‚ the graded response‚ the relationship between muscle length and tension‚ muscle tetanus‚ and muscle fatigue. These individual experiments aim to explore the way muscles can contract when an electrical
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Origin Insertion Action coracobrachialis (deepest underarm) coracoid process of scapula medial midshaft of humerus humerus: flexion‚ medial rotation‚ abduction biceps brachii short head coracoid process of scapula long head supraglenoid tubercle of scapula radial tuberosity‚ bicipital aponerousis humerus: flexion forearm: supination‚ flexion brachialis (in b/w) anterior distal half of humerus tuberosity of ulna forearm: flexion
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I. Types of Muscles a. Skeletal i. Striated ii. Uses intracellular calcium to contact iii. Big cylindrical cells iv. Multi-nucleated v. Voluntary vi. Location: attached to the bone vii. Used for locomotion b. Cardiac i. Involuntary ii. Uni-nucleated iii. Striated iv. Location: walls of heart v. Used to propel blood vi. Uses extracellular calcium c. Smooth i. Involuntary ii. Location: Walls of hallow organs iii. Non-striated iv. Uses extracellular calcium v. Spindle shaped cells
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of three different muscle types cardiac‚ smooth‚ and skeletal muscle. For this particular experiment the primary focus was skeletal muscle‚ which accounts for about 36% to 45% of total body weight and involves the integration of more than 600 different muscles (WordPress‚ 2006). Skeletal muscle contains many unique properties such as; elasticity and extensibility which allows a muscle to be stretched and return to its original state when not in use. Additionally skeletal muscles also contain a property
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Chapter 10- Muscle Tissue Choose the best answer to each of the following questions. 1) How does muscle tissue contribute to homeostasis? A) by generating heat that helps maintain body temperature B) by moving materials through the body C) by pulling on bones to move the body D) A and B are correct. E) A‚ B and C are correct. 2) The primary function of muscle is A) conversion of chemical energy into mechanical energy. B) conversion of chemical energy into radiant energy. C) conversion
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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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In this lab report I will be talking about exercise 3‚ the skeletal muscle lab. I will be going over the contraction of a frog’s gastrocnemius muscle. An overview of muscle contraction is based on the organization of the cytoskeletal proteins. The contraction is the shortening of a sarcomere‚ which is caused by the thick myosin filaments sliding past the thin actin filaments. The actual filaments aren’t getting shorter just sliding past each other. The contraction is caused by physical interaction
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contraction in skeletal muscle is caused by specialized intracellular thin and thick filaments‚ actin and myosin‚ sliding past each other. Contraction and relaxation of skeletal muscle bring about body movements. These body movements are voluntary and facilitated by the somatic nervous system. Near contact between somatic motor neurons and the muscle fibers are referred to as neuromuscular junctions. It is at the neuromuscular junctions that neurons are able to transmit a signal to the muscle fibers causing
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