Pinyin/Muscle
Muscle is a soft tissue found in most animals. Muscle cells contain protein filaments of actin and myosin that slide past one another, producing a contraction that changes both the length and the shape of the cell. Muscles function to produce force and motion. They are primarily responsible for maintaining and changing posture, locomotion, as well as movement of internal organs, such as the contraction of the heart and the movement of food through the digestive system via peristalsis.
jirouh shì dàduōshù dòngwù de ruǎnzǔzhī. Jīròu xìbāo hányǒu hùxiāng liánjiē de jīdòngdànbái hé jīqiúdànbái xiānwéi, tōngguò shōusuō cóng'ér gǎibiàn xìbāo de chángdù hé xíngzhuàng. Jīròu gōngnéng chǎnshēng lì hé dòngzuò, zhǔyào fùzé bǎochí hé gǎibiàn zīshì, yídòng; yǐjí nèizàng de yùndòng, lìrú xīnzàng de shōusuō, hé xiāohuà xìtǒng de rúdòng shǐ shíwù yídòng.