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April 29, 2013

April 29, 2013. (A Day) Agenda DSJ #41 Muscular System Bill Nye: Bones and Muscles DSR #41. April 30, 2013. (B Day) Agenda DSJ #41 Muscular System Bill Nye: Bones and Muscles DSR #41. DSJ #41. Science Notebook – 18B

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April 29, 2013

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  1. April 29, 2013 (A Day) Agenda • DSJ #41 • Muscular System • Bill Nye: Bones and Muscles • DSR #41

  2. April 30, 2013 (B Day) Agenda • DSJ #41 • Muscular System • Bill Nye: Bones and Muscles • DSR #41

  3. DSJ #41 • Science Notebook – 18B • Prompt: Place your left hand on the upper part of your right arm. Bend your right arm at the elbow. In 5 sentences or more, describe what you noticed about your muscles.

  4. The muscular system

  5. Learning Objectives • Identify the types of muscles found in the body. • Explain why skeletal muscles work in pairs.

  6. Types of Muscle • There are two groups of muscles in the body that are controlled in different ways.

  7. Types of Muscle • There are two groups of muscles in the body that are controlled in different ways. • 1. • a. Involuntary – Not under conscious control.

  8. Types of Muscle • There are two groups of muscles in the body that are controlled in different ways. • 1. • a. Involuntary – Not under conscious control. • b. Voluntary – Under conscious control.

  9. Types of Muscle • 2. Examples of what is controlled by involuntary muscles are digesting food and controlling the size of an eye’s pupil.

  10. Types of Muscles • Your body has three types of muscle tissue: skeletal muscle, smooth muscle, and cardiac muscle.

  11. Types of Muscles

  12. Types of Muscle • 4. In skeletal muscles, a strong connective tissue that attaches muscles to bone is a tendon.

  13. Types of Muscle • 4. In skeletal muscles, a strong connective tissue that attaches muscles to bone is a tendon. • 5. Because you have conscious control over skeletal muscles, they are able to react quickly. However, they also tire quickly.

  14. Types of Muscle • 6. In cardiac muscle, the repeated contractions are called heartbeats.

  15. Muscles at Work • 7. Because skeletal muscles are voluntary, messages from the nervous system cause a muscle to contract.

  16. Muscles at Work • 8. & 9. Because muscle cells can only contract, not extend, skeletal muscles must work in pairs. While one muscle contracts, the other muscle in the pair relaxes to its original length.

  17. Muscles at Work • 10. To bend the elbow, the biceps muscle contracts and the triceps muscle relaxes and returns to original length.

  18. DSR #41 • Science Notebook – 18B (Under DSJ #41) • Prompt: Describe each of the 3 types of muscles that your body has. Write one sentence for each type.

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