A muscle can only pull, not push: to return to its original position it needs an opposite (antagonist) muscle to pull in the opposite direction. So most muscles in the body come in antagonistic pairs, and when one in the pair is contracted, the other is necessarily relaxed. For i...
Muscles do not push; they can only pull. To bend the arm at the elbow, the muscle at the front of the upper arm has to shorten and bunch up. To unbend the arm other muscles in the back of the arm have to shorten. These two sets of muscles - the front and the back - are ...
“Muscles can only pull or be pulled. They cannot push,” Trammell stated confidently. She went on to elaborate that muscles often work in pairs, known as agonists and antagonists, to generate movement. An agonist, the main muscle in this process, contracts, while an antagonist is the op...
Muscles are attached to bones by tendons andhelp them to move. When a muscle contracts (bunches up), it gets shorter and so pulls on the bone it is attached to. When a muscle relaxes, it goes back to its normal size. Muscles can only pull and cannot push. ...
Muscles do not push; they can only pull. 肌肉不能推动而只能拉动骨骼。 To bend the arm at the elbow, the muscle at the front of the upper arm has to shorten and bunch up. 要从肘部弯曲手臂,就要收缩上臂正面的肌肉。 To unbend the arm other muscles in the back of the arm have ...
To relax after exercise, you can ___ your muscles gently. A. pull B. push C. stretch D. hit 相关知识点: 试题来源: 解析 C。运动后可以轻柔地拉伸肌肉来放松,A 选项拉、B 选项推、D 选项击打都不是正确的放松方式。语法点:can 后面跟动词原形。反馈...
A muscle cell has some amount of ATP floating around that it can use immediately, but not very much -- only enough to last for about three seconds. To replenish the ATP levels quickly, muscle cells contain a high-energy phosphate compound called creatine phosphate. The phosphate group is rem...
musclescanonlypullonthings-notpushthem. Seemstome,ifWeallpulltogether, WecanmakeRalphiebotmove! Letsdoit! HesevenmorethanI’dimaginedhedbe! IthinkitsreallygoingtoWork! Anamazingcombination: bonesforstructure,jointsforflexibility- andmusclesforMOVEMENT!
Muscles work by contracting and relaxing.They can only pull on your bones. They can't get longer or push. S_4_ most muscles work in pairs.Bending(弯曲) your arm is a pretty simple movement. Other movements like running andj5use many,many more muscles, all contracting and relaxing at ...
the muscle fibers in a pennate muscle can only pull at an angle, and as a result, contracting pennate muscles do not move their tendons very far. However, because a pennate muscle generally can hold more muscle fibers within it, it can produce relatively more tension for its size. There...