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Muscular system


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Muscular system

  1. 1. Muscular SystemYes, it helps us move, but it also….
  2. 2. Muscular System The muscles in our body are divided into three classes: cardiac, smooth, and skeletal. Muscles often work in pairs so that they can pull in different or opposite directions. The cells that make up muscles contract & then relax back to their original size. Tiny microscopic fibers in these cells compress by sliding past each other like a sliding door being opened & shut again.
  3. 3.  At every joint, tendons and ligaments also help out. Muscles wouldnt be very useful alone because they dont directly connect to the bone, so even if they contract, they wouldnt be moving anything. Muscles are connected to tendons, which are connected to the bones. When the muscles contract, they pull on the tendons, which in turn pull on the bones, and that causes movement.
  4. 4.  But without ligaments, that movement wouldnt be too useful because it would not be directed movement. Without ligaments, instead of bones bending or rotating about each other when muscles contract, they would slide by each other. Ligaments are what hold the bones together. They connect at the ends of muscles and keep them from slipping and sliding, and force them to bend.
  5. 5.  The muscular system interacts with other systems of the body. During inhalation, the muscles between the ribs relax, allowing the lungs to draw in air. When you digest food, muscles in your esophagus interact with the digestive system. Your nervous system tells your muscles when to move. Even your skeletal system needs your muscular system because your muscles keep your bone structure intact
  6. 6. Muscular System All muscles - Control body position using the following feedback loop:  If muscle strength too low: Systems that rely on the muscles to do the work necessary for homeostasis (heart, lungs, brain, digestive organs….) could not function
  7. 7. Diseases/afflictions of the muscular system Muscular dystophy Multiple schlerosis (MS) Muscle cramps
  8. 8. Activity Lab: Reaction Rates