1. Explain how muscles work in pairs in moving limbs.
When a muscle contracts, it pulls the bone. The muscles cant push, only pull, therefore, in order to do certain movements, the muscles need to work in pairs. One muscle has to pull, and the other muscle has to relax, because it cant push. If we would only have one muscle, we could only move in one direction.
2. Identify the structures that make up a skeletal muscle.
The 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.
The eyes because it sences the presence of the other person, sending images to the brain.
The Brain, because it sends orders to the muscles to move.
The Muscles, because it needs to contract and relax in order to give a handshake.
4. Explain how actin and myosin interact as a muscle cell contracts.
The myofibrils have the actin which is the thin filament inside the myofibrils and the myosin which is the thick filament inside the myofibril.
Proteins used to work out muscle contraction.
Your answers were really clear and understandable. However, in question number one it is a little confusing because you repeat the same idea several times. Try to reread your answers so you can give a great explanation of it. In question number four you should take your time and read the question again so you can understand what it is really asking. Great work!
ReplyDeleteAs I said before to Mariali, your answer for question 3 is correct in the sense that you mention the role different organs have involving a handshake, however you are not mentioning the name of the whole organ system. For example, I mentioned the nervous, skeletal and muscular system but when reading other answers I saw what Andre had included, the circulatory system. You can add this because trhough the whole proccess nutrients and oxygen are carried to the muscles through the blood cells traveling in the blood vessels. Also your answer to question 4 explains what each protein is, however not how they interact in order to contract.
ReplyDeleteIn question four I would have included the process on how the myosin heads bind to the actins using ATP to create a contraction of the muscle.
ReplyDeleteYour answers are correct, but I would develop a bit more in answer number three, becuase as Camila states it you do not mention the whole organ system that is being used.
ReplyDelete