Health blog!

Welcome students to our class blog. We will be using this space for class discussions to examine, evaluate, and share knowledge. Discussions provide opportunities for students to think critically on the topics we will be learning about in Health class. Concepts, assignments, and readings will be used as the basis for our discussions to create a positive learning community in which students are willing to share their ideas and to accept constructive criticism from their peers.

Monday, January 3, 2011

Concept check 27.5

Please read section 27.5 of the online Biology book on muscles. Take notes of the reading in your Health notebook. Post your answers to concept check 27.5 on the blog and provide constructive feedback to three other learners. Constructive feedback not only means you may agree with someone else's answers or ideas but as well how those ideas may open the doors to new learning opportunities.  Due date: Jan. 11, 2011

Concept check 27.5
1. Explain how muscles work in pairs in moving limbs.
2. Identify the structures that make up a skeletal muscle. Include these terms: muscle fiber, fascicle, myofibrils, actin, myosin, sarcomere.
3. Identify at least 3 organ systems involved in a handshake. Describe WHAT each system contributes to the handshake.
4. Explain how actin and myosin interact as a muscle cell contracts.
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1 comment:

  1. Maria Alicia JaramilloJanuary 10, 2011 at 5:17 PM

    Concept Check 27.5 Maria Alicia Jaramillo
    1. Explain how muscles work in pairs in moving limbs.
    Muscles in our body are only able to pull not push the attached bones, thus they need force so they can be go back to their original position. Skeletal muscles all have and opposing muscle, therefore when one muscle contracts the opposing muscle relaxes.
    2. Identify the structures that make up a skeletal muscle.
    • Muscle fiber: Long cylindrical muscle that contains nuclei.
    • Myofibrils: found inside muscle fibers.
    • Sarcomere: unit that contracts in the muscle and has two kinds of filaments, thin: actin, thick:myosin.
    • Myosin: Bump like projections composed of proteins.
    • Actin: twisted structure and are made up of protein.
    3. Identify at least three organ systems involved in a handshake. Describe what each system contributes to the handshake.
    Eyes: perceive the presence of the other person and send these images or messages to the brain.
    Brain: The brain sends messages to the muscles through the nerves. (control center)
    Muscles: The muscles of: the back, shoulder, upper arm, forearm and wrist contract and relax during a handshake.
    4. Explain how actin and myosin interact as a muscle cell contracts.
    For the contractions myosin binds to the actin (thin filament), then they move towards the center of the sarcomere. ATP binds to each myosin head and releases it from the actin.

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