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.

Thursday, January 6, 2011

Andres Jaramillo- 27.5

Concept check 27.51.
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.

Answers

1.Muscles always work in pairs and while one relaxes the other one contracts.

2.muscle fiber: long cylindrical muscle cell that contain nuclei
myofibrils: bundles of smaller units
actin: protein that makes up filaments
myosin:protein that make up thick filaments
sarcomere: muscle fiber basic unit of action


3. Muscles, bones and nerves are involved in hand shaking.
First you use your brain to coordinate. The eyes notice the presence of the other individual. Then use your muscles to relax and contract, then your nerves feels a sensation. You use 5 muscles (back, shoulder, upper arm, forearm, and wrist) and 27 bones.


4. Both actin and Myosin are proteins that make up filaments in the muscles.
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4 comments:

  1. Maria Emilia ViteriJanuary 6, 2011 at 8:08 PM

    your ansewrs are very well explained, and i agree with everything you said

    ReplyDelete
  2. emii alarconJanuary 8, 2011 at 9:02 AM

    i understood all your answers and it is really simple but helpfull.

    ReplyDelete
  3. isaiturraldeJanuary 8, 2011 at 12:04 PM

    Andres you were really organized, which made it easy to read. You information is short but detailed, i understood what you wrote very well!

    ReplyDelete
  4. Mauricio BustamanteJanuary 9, 2011 at 7:57 PM

    1. Explain why you need two muscles, and don´t just have one relax and one contract.
    2. How are these related?
    3. Very clear relationship between them.
    4. How do they work together. Explain how a muscle contracts and relaxes.

    ReplyDelete

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