LABORATORY REPORT (Click on the Save a Copy button on the panel above to save your report) Activity: Name: Instructor: Date: Twitch Contractions and Summation Katrelle Bond Rachel Waite November 7‚ 2014 Predictions Effect of Muscle Fiber Length on Contraction 1. As muscle fiber length increases contraction force increases. Effect of Stimulation Frequency on Contraction 2. As the frequency of stimulation increases‚ the force of contraction: increases. Materials and Methods Measurement of Threshold
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REVIEW SHEET EXERCISE 2 Skeletal Muscle Physiology NAME: LAB TIME/DATE: Electrical Stimulation 1. Name each phase of a typical muscle twitch‚ and‚ on the following line‚ describe what is happening in each phase. a. b. c. 2. In Activity 2‚ how long was the latent period? __________ msec Describe the chemical changes that are occurring during this period. The Graded Muscle Response to Increased Stimulus Intensity 3. From Activity 3‚ describe the effect of increasing
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Animals have three types of muscles; skeletal‚ smooth‚ and cardiac. This lab however is only concerned with skeletal muscle. A special characteristic of skeletal muscle is their ability to contract or shorten via thin (actin) and thick (myosin) filaments (Flanagan‚2017). This gives a striated appearance which is a key distinguishing characteristic between other types of muscle (Flanagan‚2017). Skeletal muscle is also multinucleated. Skeletal muscle needs plentiful amounts of energy to be able to
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Your best friend Sophie is a competitive gymnast and trains at least three hours a day‚ six days a week‚ for as long as you can remember. She does great in school and gets straight A’s on her report cards. You usually tell each other everything‚ but lately she is always moody‚ irritable and hard to talk to. Her competitive gymnastics training has led her to attempt eating healthy but she has always been a picky eater and never liked vegetables‚ and refused to eat butter or ice cream. Recently
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1. Discuss the relationship between distribution of muscle fiber type and performance. How might exercise training modify or change a person’s fiber-type distribution? Skeletal muscles contain multiple fiber types that are distinguished by their different myosin ATPase speed‚ and the development of their SR. The two main fiber types are type I and type II fibers. Type II fibers have a faster ATPase and a more developed SR than type I fibers. Type II fibers are also part of a larger motor unit‚
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AGONIST- Prime mover‚ the muscle responsible for producing a particular joint movement. It is responsible for the movement you see. EX- Pectoralis Major in bench press. ANTAGONIST- Opposing muscle to the prime mover that passively elongates or shortens to permit motion to occur. EX- Hamstring in leg extension SYNERGIST- Any muscle assisting the prime mover. EX- Deltoids assist the pectoralis major in bench press MEDIAL- Closer to the midline. LATERAL- Further from the midline.
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Question: A patient is admitted for electroconvulsive treatment (ECT). The physician orders the neuromuscular blocking agent metocurine iodide (metubine) to reduce trauma by relaxing skeletal muscles. Explain the process of muscle contraction and how a neuromuscular blocking agent‚ such as metubine‚ would interfere with muscle contraction. Aaron arrived at the hospital with the following symptoms: drooping eyelids; fatigue and weakness of his muscles; and difficulty talking‚ breathing and swallowing
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The Back squat is a predominantly lower-body exercise used extensively in strength and conditioning as a tool to quantify lower-body strength and as a training exercise‚ it’s also one of the three exercises evaluated in the sport of powerlifting. Due to the competitive nature of powerlifting and the many federations that govern it‚ supportive equiptment is widely used to differing degrees between federations. Knee wraps are likely one of the most frequently utilised products of supportive equipment
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Due to the warm weather conditions and the prolonged physical activity without water‚ it is easy to recognize that the player is experiencing extreme dehydration and is probably suffering from an exertional heat stroke. The biggest indicator that the player is having a heat stroke is due to the fact that he appears to be unconscious after having been what seemed to be extremely disoriented during the 50-yard sprints. Along with the flushed dry skin and the rapid shallow breaths‚ the victim may also
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Hip flexors are a group of muscles located in your hips that assist you in moving your leg or knee upwards toward your body. It is located at the meeting point of the thigh and hip. When the fibers of these muscles are stretched or torn‚ it is called a hip flexor strain. Someone who is suffering from a hip flexor strain will experience a sudden or sharp pain located in the front of their hip or their groin area‚ indicated by the red circles in the photo to the right. This pain will occur when they
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