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.
I don’t know but I think it is IDK SUPPER SORRY
Answer: no, the 2nd one.
Explanation: sweat cools the body, which is why when you’re working out hard, you sweat. If you were to not sweat, your body would overheat
