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.
1. Muscle Endurance
2. Cardiovascular Fitness
3. Muscle Strength
4. Flexibility
5. Body Composition
Answer:
D
Explanation:
because she is a services staff