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## Muscle - **LO.** To learn and understand the muscle tissue in the human body. - **Muscle accounts for 40% of a person's weight.** - **What is muscle?** A kind of fibrous tissue that has the ability to control and produce movement. - **What is myofibril?** Contractile thread of a muscle that exte...

## Muscle - **LO.** To learn and understand the muscle tissue in the human body. - **Muscle accounts for 40% of a person's weight.** - **What is muscle?** A kind of fibrous tissue that has the ability to control and produce movement. - **What is myofibril?** Contractile thread of a muscle that extend from one end of the muscle fiber to the other. - **What 2 filaments are myofibrils made of?** Actin and Myosin - **Which is thicker, Actin or Myosin?** Myosin is thicker. - **What are the organized units of Actin and Myosin called?** Sarcomeres, which when joined end to end, form the myofibrils. - **What is the basic structural unit of a muscle?** Sarcomere - **What is a normal temperature range for humans?** 36°C - 37°C - **How many times can a muscle be stretched without ripping?** 3 times. - **What is contractility?** Ability of a muscle to forcefully shorten.