1. Explain how muscles work in pairs in moving limbs.
Muscles work in pairs because it can only pull but not push. Therefore, a muscle contracts while the other relaxes creating the movement in the limbs.
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 with many nuclei.
- myofibrils: small bundles of smaller units that are inside the mucle fiber.
- actin: is the protein that makes up the thin filament of the sarcomere.
- myosin: is the protein that makes up the thick filament of the sarcomere.
- sarcomere: basic unit of action of the muscle fibers.
- fascicle: small bundle of a nerve, tendon, or muscle fibers.
3. Identify at least 3 organ systems involved in a handshake. Describe what each system contributes to the handshake.
- muscular system: the muscular system will be the one to allow all the muscles needed for a handshake to move.
- nervous system: the nervous system will send the signals from the brain through the nerves to make the muscles work.
- circulatory system: the circulatory system will provide the nutrients and oxygen to the muscles so they can work properly.
4. Explain how actin and myosin interact as a muscle cell contracts.
In each contraction, myosin heads first bind to thin filaments. Then, myosin heads bends pulling the thin filaments to the centre of the sarcomere. ATP finally realeases the myosin heads from the thin filaments allowing to bind with other filaments to make other muscle contractions.
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ReplyDeleteYour answer for question 1 clearly anwers what is asked, however it is too simplified and I think it needs a more detailed explanation. You could specify about how muscles are attached to the bones, therefore once a muscle called the flexor bends a bone, the opposing muscle called extensor straightens it. In this way they work together to move our body parts.
ReplyDeleteI liked the way in which you put your own words to explain the parts of the skeletal muscles. In question number four you explained really well the way on how myosin and actin work together to create a conrtaction.
ReplyDeleteI simply loved the way you explained question number 3 for it helped me understand clearly how each system contributed to the handshake. When I was doing this question I had a hard time understanding the contribution of each of the systems, but after reading your answer it was clear what each system contributed to the handshake.
ReplyDeleteGreat detailed answers!