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 10, 2011

concept check 27.5 Pablo Martin Lucio-Paredes

1.explain how muscles work in pairs in moving lims.
when muscles function they need an opposing motion to bring the bone back to its original position, that's why they work in pairs, as one muscle contracts and other one has to relax.

2.identify the structures that make up skeletal muscle, include these terms: muscle fiber, fascicle, myofibrils, actin, myosin, sarcomere.
muscle fiber: single long muscle cell that contains many nuclei
myofibrils: smaller untis of a fyber
actin: protein that composes filaments
sarcomere: muscle fiber's basic unit of action
myosin: protein that composes thick filaments
sarcomere:

3. identify 3 organ systems involved in a handshake, describe what each system contributes to the handshake.
eyes: the eyes sense the other person and give the information to our brain.
brain: sends the command to start the handshake.
muscles: muscles in our back, arm, shoulder and forearm relax and stretch so the handshake can start, then many muscles manipulate the 27 bones in our hand.

4.explain how actin and myosin interact as a muscle cell contracts.
myosin binds to the actin, then move towards the center of the sarcomere, atp binds to myosin realising it from the actin
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