Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Muscular System • The Muscular System: 1. Allows us to move our bodies 2. Keeps our bodies warm 3. Protects our joints What does the muscular system do? • Muscles are made of muscle fibers. • Muscle fibers are made up of long, paired strands of proteins. What are muscles made of? • There are two groups of muscles: 1. Voluntary-Muscles we can control that are connected to bones and allow us to move. 1. Involuntary-Muscles we cannot control like the muscles that make our heart beat. Muscular System •Three types of muscles: 1. Skeletal-voluntary muscle that attaches to bones 2. Smooth-involuntary muscle that are found inside the organs 3. Cardiac-involuntary muscle that the heart is made of. Types of muscles • Even when your muscle is not contracting enough to cause movement, a few of its individual fibers are still contracting. • This doesn’t cause movement but it does tense and firm the muscle. • This slight tension is called muscle tone. • Example: your neck contracts just enough to keep your head up even when you are not moving your head. • Muscle tone keeps your muscles healthy and ready for action. Muscle Tone • Muscles that cannot contract due to injury, or muscles that are not used often, will weaken and shrink • This is a condition known as atrophy Atrophy • Skeletal muscles work together to move the body. (contraction vs. extension) • The brain sends a signal to the muscles to either contract or relax. • Example: The biceps contract as the triceps extend to bend the arm. Muscles working together • When you lift something heavy, the muscle fibers contract. • Repeated strong contractions cause the muscle fibers and the muscle itself to grow in diameter and strength. • Moderate contractions won’t increase the diameter much but it will increase the endurance by allowing it to obtain more oxygen. What causes muscles to get bigger when you exercise? • Muscles need oxygen in order to produce energy for contraction • When muscles work really hard they use up all the oxygen at hand and less energy is available for contractions. • In order for muscles to keep working without oxygen there is a process that makes the chemical, lactic acid which provides small amounts of energy. • Lactic acid is poisonous to cells though. So the body needs time and rest to get more oxygen and erase the oxygen debt. Muscles get tired… • Work your muscles! • Avoid muscle injuries – regular strengthening and stretching exercises can help prevent injuries. • Vary your exercise routine so that your are not always using the same muscles • Warm up before vigorous exercise and include a cool down • Stop exercising if you feel sharp or sudden pain • Prevent muscle cramps – stretch and drink plenty of water Keeping your muscles healthy A few main muscles… • https://www.youtube.com/watch?v=rMcg9YzNSEs • https://www.youtube.com/watch?v=C6u0u_59UDc More Muscle Info…