The time it takes to move in responce to a stimulus is called the reaction time
The flu can be treated with an antibiotic
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.
The answer is C. Muscle fiber or Sarcomere.
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