![]() ![]() The nerve and the fibers it controls are called a motor unit. Each nerve will control a certain number of muscle fibers. This signals the muscle fibers to contract. When we choose to contract a muscle fiber-for instance we contract our bicep to bend our arm upwards-a signal is sent from our brain via the spinal cord to the muscle. Each muscle fiber is an individual muscle cell and may be anywhere from 1 mm to 4 cm in length. ![]() They are under conscious control, which means that we can consciously choose to contract a muscle and can regulate how strong the contraction actually is. Skeletal muscles are attached to the skeleton and are responsible for the movement of our limbs, torso, and head. Responsible for many tasks, including movement of food along intestines, enlargement and contraction of blood vessels, size of pupils, and many other contractions. Responsible for the contraction of the heart. Muscular Strength and Endurance Types of Muscle However, achieving the best muscular performance requires the assistance of a trained professional.įor more information on muscular fitness and endurance, please click on the link below: This chapter explores many ways to resistance train. Resistance training is the method of developing muscular strength and muscular endurance, which in turns improves wellness. Muscular strength is the amount of force that a muscle can produce one time at a maximal effort, and muscular endurance is the ability to repeat a movement over an extended period of time. The largest portion of energy expenditure in the body happens in muscles while helping us perform daily activities with ease and improving our wellness. Muscles are used for movement in the body. Without muscle cells, we would be unable to stand, walk, talk, or perform everyday tasks. ![]() There are over 600 muscles in the human body they are responsible for every movement we make, from pumping blood through the heart and moving food through the digestive system, to blinking and chewing. Muscles are powered by muscle cells, which contract individually within a muscle to generate force. Muscles are highly specialized to contract forcefully. Assess your muscular strength and endurance.Describe an effective resistance exercise program.Describe muscular structure and function. ![]()
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