The Muscular System Class #3

Class Objectives 1st: Learn how we can keep our muscles healthy. 2nd: Understand how muscles help us maintain homeostasis. 3rd: Understand what happens to our bodies if we don’t exercise.

Healthy Muscles Recall that a good diet keeps your bones healthy

Healthy Muscles Your muscles benefit from a healthy diet, too.

Healthy Muscles All muscles require energy to contract. This energy comes from the food you eat.

Healthy Muscles Eating a diet full of nutrients such as protein, fiber, and potassium can help keep muscles strong. Protein Fiber Potassium

Healthy Muscles Exercise also helps keep muscles healthy. Muscle cells decrease in size and strength without exercise, as shown in Figure 14. Running Swimming Weight Lifting Cycling

Healthy Muscles Decreased muscle strength can increase the risk of heart disease and bone injuries. It can also make joints less stable.

The Muscular System and Homeostasis There are many ways the muscular system helps your body maintain homeostasis.

The Muscular System and Homeostasis You are probably sitting in a room where the temperature is somewhere between 21 C and 27 C. However, your body temperature is around 37 C.

The Muscular System and Homeostasis Your body must stay at this temperature to function well. As you have read, muscle contractions convert chemical energy to thermal energy and keep your body warm.

The Muscular System and Homeostasis When you exercise, your cells need more oxygen and release more waste, such as carbon dioxide.

The Muscular System and Homeostasis The cardiac muscles of your heart help maintain homeostasis by contracting more often.

The Muscular System and Homeostasis When it contracts faster, the heart pumps more blood and more oxygen is carried to the cells.

Class Objectives 1st: Learn how we can keep our muscles healthy. 2nd: Understand how muscles help us maintain homeostasis. 3rd: Understand what happens to our bodies if we don’t exercise.

Homework Name:____________ Translate the words into Chinese and then send me a WeChat message saying the words in English Body Temperature:___________ Function:___________________ Thermal Energy:______________ Oxygen:_________________ Carbon Dioxide:______________ Cardiac Muscles:_____________ Healthy Muscles:___________ Diet:_____________________ Contract:_________________ Nutrients:_________________ Protein:__________________ Fiber:____________________ Potassium:________________ Muscle Cells:______________ Heart Disease:_____________ Bone Injuries:______________ Less Stable:_______________ Homeostasis:______________