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Muscles

Muscles. IV. How muscle & bone interact. A. Skeletal muscles produce movement by contracting on body parts. B. Individual muscles can only pull in one direction. 1. Work in opposing pairs, when one contracts the other relaxes. Mini activity.

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Muscles

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  1. Muscles

  2. IV. How muscle & bone interact A. Skeletal muscles produce movement by contracting on body parts. B. Individual muscles can only pull in one direction. 1. Work in opposing pairs, when one contracts the other relaxes

  3. Mini activity • Hold your arm out straight and parallel to the floor. Now, “make a muscle.” As you flex your biceps muscle, notice what happens to the rest of your arm. • When you relaxed your bicep your arm goes straight. what allows your arm to straighten in a controlled manner? • If you did not have your triceps what would the movement of the arm look like when you relaxed the bicep?

  4. Draw the following bones w/ the bicep & tricep. Make sure to show where the tendon attaches!!

  5. Figure 36-11 Opposing Muscle Pairs Section 36-2 Movement Movement Biceps (relaxed)

  6. 2. The bicep/tricep is an example of opposing pairs. 3. There is a balance of the muscles that the brain must learn. a.Think of a baby learning to walk. b.Or a musician learning to play the violin or drums c. Or a athlete learning to throw or swing 4. Muscle coordination takes practice!

  7. C. Muscles are attached to bone w/ tendons D. Joints are usually involved in movement.

  8. 1. The Organization of Skeletal Muscle. Skeletal muscle Fasicles (bundle of muscle cells (fibers)) Muscle cells (aka: muscle fibers) myofibril (a muscle cell organelle composed of…) sarcomeres (units w/i the myofibrils made of alternating…) myofilaments (protein chains either THICK (myosin) or THIN (actin)) Z lines (region of separation between sarcomeres)

  9. Similar to your coloring sheet

  10. 1st coloring sheet side 2. When you are done have me check it. • The 1st side are the 3 types of muscle tissue…do that on your own (HW). • Once you are done coloring you will begin planning the construction of your muscle. • Once you have your plan approved you will build/Color your fasicle. • You should complete by the end of class • HW: writing prompt & color 1st side: types of muscle tissue

  11. Build A Skeletal Muscle. Use all available information= coloring sheet, anatomy book, picture book, Reineke to help you construct the skeletal muscle from the given materials. You must represent the following in your model: • Fasicles (bundle of muscle cells (fibers)) (covered in perimysium)- total of 1 per table • Muscle cells (aka: muscle fibers)- 7 per fasicle • myofibril (a muscle cell organelle composed of…) • Myofilaments- color chenille rods to show myosin & actin • As a class we will then build a section of Skeletal muscle (covered in epimysium-ie paper)

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