Muscle Contraction Case Study

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1.) List and briefly explain the meaning of each of the following characteristics of muscle tissue; extensibility, elasticity, excitability, and contractility. Extensibility: The ability for muscle tissue to stretch. Elasticity: The ability of muscle to return to its normal resting size after being stretched. Excitability: The ability of muscle tissue to receive a stimulus from the nervous system. Contractility: The quality that distinguishes muscle tissue from other types of tissue. 2.) Name the three types of muscle tissue found in the human body and briefly describe the primary function of each. Skeletal muscle: attached to the bones of the skeletal system. Smooth muscle: Primarily lines hollow internal structures such as blood vessels or the digestive tract. Cardiac…show more content…
Each time a cross-bridge from the myosin filament releases from an actin filament energy is used. Therefore, the more muscle tissue you have,and the more you use it, the greater your energy expenditure'which is also caloric expenditure. 5.) Define and describe concentric and eccentric muscle actions. Define motor unit. A concentric action is a shortening contraction. The muscle becomes shorter and overcomes the resistance. An eccentric muscle action is a lengthening contraction. The muscle contracts and tries to shorten but is overcome by the resistance. 6.) Define motor unit. A motor unit consists of a single motor nerve and all the muscle fibers to which it sends impulses. 7.) Explain how the size and number of motor units required for a given task affect the amount of force produced by a muscle. A motor nerve is connected to a motor unit and the brain sends the signal and the number of motor units used depends on the amount of force needed to complete a task, the motor nerves are connected to the
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