1. Upper body stretch
2. Knee-to-chest pose
3. Light jogging or walking
Using the top shelves in the storage room for food, and the bottom shelves for chemicals.
Answer:
B) Valves closing
Explanation:
A healthy heart makes a lub-dub sound with each beat. This sound comes from the valves shutting on the blood inside the heart. The first sound (the lub) happens when the mitral and tricuspid valves close.
