IndexEnergy SystemsMicro tears in muscle fiberIncreased muscle flexibilityLactic acid is produced when glucose is broken down and oxidized. During intense exercise, when oxygen levels are lower, more lactic acid is produced, which produces hydrogen ions and a burning sensation in the muscles while they are active. However, persistent pain in the days following intense effort is not due to an accumulation of lactic acid but to small muscle tears and inflammation. Say no to plagiarism. Get a tailor-made essay on "Why Violent Video Games Shouldn't Be Banned"? Get an Original EssayEnergy SystemsStress on the muscles during exercise leads to small tears in the muscle fibers, these tears will cause swelling on the muscle tissues, this makes pressure on the nerve ending and pain. To repair these tears you need to take protein in the form of food or protein shakes to build and repair these tears making them stronger. Micro tears of muscle fibers Acute responses to the skeletal system are shown by changes in the joints. Synovial fluid is secreted in the joint, synovial fluid helps provide greater range of motion during acute exercises. As synovial fluid is secreted, it becomes less viscous making it easier for a wide range of movements to occur. Greater freedom of movement Warming up before exercise is very important as it helps prevent injuries. This happens as we warm up, we produce heat, as our muscles contract and create friction. When you exercise it increases muscle flexibility, which means that your muscles are more flexible if they are flexible. As muscles become flexible, this can also lead to fewer injuries. Increased Muscle Flexibility As the blood supply becomes higher, an increase in temperature and metabolic activity occurs. When we start exercising, our muscles work faster to produce energy at a faster pace, to keep up with this movement and speed in the muscles. Oxygen in red blood cells and other nutrients such as minerals are incorporated into the muscles to provide these muscles with energy (glucose). During exercise our muscles contract causing friction, producing heat. 70% of body heat is produced by energy production in muscle tissue. Please note: this is just an example. Get a custom paper from our expert writers now. Get a Custom Essay Vasodilation of capillaries on the skin occurs to help control body temperature, allowing more blood to reach the skin and thus causing our body to sweat. If the temperature in our body is not kept cool and becomes overheated, the enzymes in our body will begin to die. The greater the demand for oxygen is satisfied by an increase in blood flow through the dilation of the capillaries.