Please read section 27.5 of the online Biology book on muscles. Take notes of the reading in your Health notebook. Post your answers to concept check 27.5 on the blog and provide constructive feedback to three other learners. Constructive feedback not only means you may agree with someone else's answers or ideas but as well how those ideas may open the doors to new learning opportunities. Due date: Jan. 13, 2011
Concept check 27.5
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.
1. Explain how muscles work in pairs in moving limbs.
ReplyDeleteMuscles and bones are attached by tendons, this permits the skeletal muscle to contract. Muscles are only able to pull so they have pairs of muscles. As of them contracts the other one relaxes and lets the muscles to move.
2. Identify the structures that make up a skeletal muscle.
Our muscles are made of bundles with muscle fibers, which are long cylindrical muscle cells with multiple nuclei. The muscle fiber is made out of myofibrils, which have alternating dark and light areas, that’s why they are called striped muscles. Myofibrils contain and are made of sarcomeres basic unit of action and the unit that contracts. Sarcomeres have two types of filaments: thick filament also known as myosin that have myosin heads; and thin filament called actin proteins that contract.
3. Identify at least three organ systems involved in a handshake. Describe what each system contributes to the handshake.
A handshake looks really simple, but is pretty well organized by our brain. Fist you use your eyes to see that you need to extend your arm, then the brain conducts this info through your nerves. Then you extend your arm and use your 27 bones in your hand to grab and squeeze the other hand. Then you use your muscles which are been energized by oxygen, and nutrients conducted through the blood vessels.
4. Explain how actin and myosin interact as a muscle cell contracts.
Myosin heads first bind to thin filaments. Next, the myosin heads bend, pulling the thin filaments toward the center of the sarcomere. ATP then binds to each myosin head, releasing it from the thin filament. The myosin head is now free to attach at a new spot and further pull the thin filament along.
Francisco be careful with typing errors, you have some that make the reading of your answer a little complicated. In the other hand your answers are well written and the explanations are really easy to understand.
ReplyDeleteConcept Check 27.5 (MartÃn Vela)
ReplyDelete1. Explain how muscles work in pairs in moving limbs.
All muscles work in pairs. Tendons attached muscle to bone. Whether they are smooth muscle or cardiac muscle makes no difference, all muscles must work in pairs. This is because they can contract and relax but cannot push or stretch by themselves. When your biceps contracts it flexes meaning the elbow joint bends. At the same time it also pulls the triceps to make it longer. So the triceps is stretched by the biceps pulling it. When the triceps contracts are extends meaning the elbow joint straightens. At the same time it pulls the biceps and makes it longer. Also as one muscle contracts, the other relaxes. So in this process there are two muscles working together.
2. Identify the structures that make up a skeletal muscle.
Muscle fibers are bundles of smaller units called myofibrils. A myofibril consists of a single repeating unit called sarcomeres. The sarcomere is the muscle fiber's basic unit of action. It is the unit that contracts. Each sarcomere is composed of two kinds of filaments, thin and thick. The thin filaments are composed of the protein actin and have a twisted, ropelike structure. While the thick filaments are composed of the protein myosin and have bumplike projections called myosin heads.
3. Identify at least three organ systems involved in a handshake. Describe what each system contributes to the handshake.
When you shake your hand with someone else you use numerous organs that involves in a handshake. For example your bones in your hand give support and the position that you want the hand to be in. Muscular (muscles), helps hand move. Many muscles in the hand help manipulate the 27 bones in your hand into place. Tendons that connect muscle to bone help the muscle move the hand. The last is the nervous system because the brain as the main control center of your body, tells your hand what to do. The brain also directs each and every movement involved in the handshake through an extensive network of nerves. The nerves also helps feel what the hand is touching.
4. Explain how actin and myosin interact as a muscle cell contracts.
The interaction of myosin heads with the thin filaments is the key to muscle contraction. In each mini contraction, myosin heads first bind to thin filaments. Next, the myosin heads bend, pulling the thin filaments toward the center of the sarcomere. ATP then binds to each myosin head, releasing it from the thin filament. The myosin head is now free to attach at a new spot and further pull the thin filament along. Note that the filaments themselves don't get shorter, but as they slide across one another, their overlap increases. The sarcomere shortens. The process can continue until the sarcomere is fully contracted. As the sarcomere of many muscle fibers shorten together, the entire muscle contracts.
1. Explain how muscles work in pairs in moving limbs.
ReplyDeleteAll muscles work in pairs. Tendons attached muscle to bone. all muscle work in paris becuase they help any bone relax and contract. This is because they contract and relax but cannot push or stretch. for example when the bicep contracts the tricep relaxes and viceversa so if the bicep relaxes the tricep contracts. .So this is how the two muscles work together.
2. Identify the structures that make up a skeletal muscle.
Muscle fibers are formed of smaller units called myofibrils. A myofibril is made up of a single repeating unit called sarcomeres. muscle fibers are mostly formed of sarcomere. Each sarcomere is composed of two kinds of filaments, thin and thick. The thin filaments are composed of the protein actin and have a twisted structure. The thick filaments are composed of the protein myosin and have bumplike projections called myosin heads.
3. Identify at least three organ systems involved in a handshake. Describe what each system contributes to the handshake.
A handshake involves many muscles and organs.. For example your bones in your hand give support and the position that you want the hand to be in an muscles help your movement when you shake. also some mscles help move or keep inplace the bones in your hands. Tendons help connect muscles to bones so it helps movement. the most important would be the nervous system because the brain controls the movements,it tells you had what to do. The brain also by the extensive network of nerves helps in evrything un your body in the hanshake. The nerves also helps feel what the hand is touching.
4. Explain how actin and myosin interact as a muscle cell contracts.
Myosin heads bind to thin filaments. then the myosin heads bend, pulling the thin filaments toward the center of the sarcomere. ATP then attaches to each myosin head, releasing it from the thin filament. so hte myosin head is free to attach at a new part of the it wants.
francisco after reading your answer to question 4 in understood better but still i dont fully understand the question. martin you responses are very full explainded and are very well done.
ReplyDelete1. Explain how muscles work in pairs in moving limbs.
ReplyDeleteThey work in pair becouse they help each other with contractions and relaxations and also becouse they are united to tendons.
2. Identify the structures that make up a skeletal muscle.
THey are made of two type of fibers a thin an a thick and they are mostly composed of proteins .
3. Identify at least three organ systems involved in a handshake. Describe what each system contributes to the handshake.
musccle: for the movement
tendons: for conection of muscles
ligaments: for flexibility
4. Explain how actin and myosin interact as a muscle cell contracts
It interacts becouse is attached to the filaments and these causes to bends and with that they have to release ATP energy so it can go to each myosin head.
When i read martin anser it helped me understand question four of the myosin
ReplyDeleteEmilia also helped me better with the explanation of the muscle contractions becouse of the tendon and the ligaments with their respective funtions
ReplyDeleteFrancisco thanks for the explanation of the systems that are in the hand that made me realizad that thre alot more that I thought.
ReplyDeleteMartin Vela helped me clrify my answer for the first question, because of the way he answered it.
ReplyDeleteI agree with alicias comment to francisco, because even though i did understand hes answers, his errors confused me.
Alicias answer to question 4 helped me understand better that part of the reading
Martin's answer to question 1 helped me understand more the concept since it was written in a very descriptive way which was easy to understand.
ReplyDeleteMartin! I was reading your answer to question number 4 and I like a lot that you have add the ATP use, and the very well and detailed explanation of how myosin works.
ReplyDeleteSantiago Viteri! It is good your answer for number 2. But you should have explain a little bit more about how the structures work for the reader to have a better understanding of the question. Otherwise is good.
ReplyDeleteEmilia Naranjo! I liked your answer for number 3, due to all the detail that you put about tendons, brain, muscle, etc... These was very helpfull for me when I was reading to understand and have a better image of what involves and how it works when you shake your hand.
ReplyDeleteMartins infromation for question numer 1 helped me a lot becasue he explaines really good how the bones need to work in pairs so they can move in more than one direction. With his explanation I was able to understand in a interesting way how as muscle contracts the other relax! thanks a lot for your help!
ReplyDelete