1. The Muscular System
Class #3

2. 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.

3. Healthy Muscles
Recall that a good diet keeps your bones healthy

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

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

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

7. 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

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

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

10. 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.

11. 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.

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

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

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

15. 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.

16. 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:______________