Topics: Cardiovascular Quiz
Heart sound cause by the closure of the tricuspid and mitral valves
A. S4
B. S1
C. S3
D. S2
Select your answer:

Topics:
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Anatomy & Physiology › ViewThe brain controls the ____.
A. ability to think and feel
B. circulation of blood
C. breathing motion
D. connection between two or more bones
Vision & Hearing › View
Loud noises have a _________ number of decibels
A. higher
B. lower