REVIEW SHEET EXERCISE 2 Skeletal Muscle Physiology NAME: LAB TIME/DATE:9pm.. 4.8.11 Electrical Stimulation 1. Name each phase of a typical muscle twitch‚ and‚ on the following line‚ describe what is happening in each phase. a. Latent-stage from rest to muscle tension begins b. Contraction-At this stage the muscle reaches its peak in contraction c. Relaxation- muscle is shortened‚ returns to zero and back initial length. 2. In Activity 2‚ how long was the latent period? ___2
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Exercise 2: Skeletal Muscle Physiology: Activity 2: The Effect of Stimulus Voltage on Skeletal Muscle Contraction Lab Report Pre-lab Quiz 1. Skeletal muscle fibers are innervated (stimulated) by c. motor neurons. 2. A single action potential propagating down a motor axon results in d. a single action potential and a single contractile event in the muscle fibers it innervates. 3. In resting skeletal muscle‚ calcium is stored in c. the sarcoplasmic reticulum. 4. During the latent period
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Anatomy of Knee The knee is composed of 4 bones: the femur‚ tibia‚ fibula and patella. Every one of these bones are practical in the knee joint‚ aside from the fibula. The patellar tendon elongates from the inferior pole of the patella‚ as an extension of the tendon of the quadriceps femoris muscle to the tibial tuberosity. The role of the patella tendon is to transfer the force of the quadriceps muscles‚ much like a rope around a pulley‚ as your knee straightens. (John Miller‚ 2015) Definition
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The diameter‚ number of axons in the sciatic nerve‚ speed of transmission and degree of myelination can all have an effect on the sciatic nerve and therefore the peak contractile force of B. Marinus. The diameter of the axon in the sciatic nerve would impact how fast the action potential is conceived down the axon to the synaptic cleft and muscle (Firmin‚ L. 2014). If one of the toads had a smaller axon diameter it would allow for resistance to movement to occur due to friction. The diameter of the
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A muscle is a group of cells called fibers‚ and are generally quite big. One muscle fiber has a large amount of myofibrils‚ which are muscle proteins in the shape of cylinders. These myofibrils contain two different types of filaments‚ which run along the axis of the fiber in hexagonal patterns. The two types of filaments are thick and thin filaments. Every thick filament is surrounded by six thin filaments. Both thick and thin filaments are attached to a structure called the Z-line. The Z-line runs
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Slow-Oxidative (Type I) Muscle Fibres Shelby Daye Skeletal muscles are classified as striated and voluntary. They are found in muscles that maintain low-intensity contractions for long periods without fatigue. A single skeletal muscle cell is referred to as a muscle fibre. There are three types of muscle fibres found in the human skeletal muscle system including slow-oxidative fibres‚ fast-oxidative fibres and fast-glycolytic fibres. These three fibres are each defined by their biochemical capacities1
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Shoulder Joint Anatomy Shoulder joint is a complex multi-dimension joint in the human body‚ also known as the “ball-and-socket”. The fact behind the label of this joint that it’s very mobile and it can be easily injured. For example‚ people can suffer instability of the glenohumeral joint by posture‚ sports‚ or normal due to aging. Shoulder joint has multiple bones‚ ligaments‚ tendons and muscles to maintain equilibrium. The bones are scapula‚ humerus‚ clavicle and sternum. Moreover‚ these bones
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Lab Report Assistant This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions‚ diagrams if needed‚ and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor
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BIOMECHANICS Biomechanics is the study of the body in a mechanical sense. This field attempts to make sense of the complexity of human movement by looking at the parts involved‚ analogous to the manner in which a car mechanic may explain how a vehicle works. The biomechanics of volleyball refers to the application of this field specifically to the movements in the sport. The movements of Volleyball are a complex combination of strength‚ power‚ agility‚ and finesse. Each of these components is
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LABORATORY 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
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