Concept check 27.5
1. Explain how muscles work in pairs in moving limbs.
Muscles cannot push. therefore they just pull, they need a opposing motion to return to their original position. For each skeletal muscle contracting there is an oppossing muscle with is relaxes, this muscle can contract and pull the bone in the opposite direction.
2. Identify the structures that make up a skeletal muscle. Include these terms: muscle fiber, fascicle, myofibrils, actin, myosin, sarcomere.
Muscle fiber:single, long cylindrical muscle cell containing many nuclei
Myofibrils:bundles of smaller units inside a muscle fiber
Actin: Protein, that makes up thin filaments.
Myosin:Protein that makes up thick filaments.
Sarcomere: unit that contracts in the muscle
3. Identify at least 3 organ systems involved in a handshake. Describe WHAT each system contributes to the handshake.
Eyes: sense the presence of someone, something and sends these message to the brain.
Brain: The thinking part of our brain, starts the shaking. Then other regions of it, send messages to your nerves to an array of muscles.
Muscles: The muscles responde to the messages by coordinating contractions and relaxations in the muscles of your body. The brain also acts as a control center, directing the actions and moventent that handshaking involves, through nerve networks.
4. Explain how actin and myosin interact as a muscle cell contracts
The interaction of myosin with actin is key to the contraction of muscles. To begin, myosins bin to the thin filaments. Then, the myosin head bends, pulling the actin toward the sarcomere. Then ATP binds to each of this heads. The myosin now is free to attach to a new spot and pull the thin filament. AS the filaments slide past each other, they overlap themselves, the process continues until the sarcomere is completely contracted.
in number 3 I think it was very important to put the participation of muscles in this process which you didn't put, for number 4 I really like your answer it's really complete and you use all key terms, number 1 should of said that you need these to put bones back into their position
ReplyDeleteIt is a very good work, you have easy and correct answers though you should include fascicle and that way use all terms, but even then it feels very complete.
ReplyDeletei guess that in number two you are missing more explanation, not just putting it in bullets. The rest is good
ReplyDeleteMaca,
ReplyDeleteYour answers were extremely short and sweet.
The way you emphasized accuracy truly showed the reader what was actually important about this section and what was needed to be learned.
I just think that maybe on number 3 you could explain that the eyes are part of the nervous sytem contributing to the handhshake to send signal.
Overall great accuracy and practicity! :) keep up the good work!