Jstam Jstam
  • 22-04-2015
  • Biology
Answered

Which of the following is most important to the heartbeat?
a. aortic valve
b. sinoatrial node
c. lymph node
d. tricuspid valve



Answer :

deb9386 deb9386
  • 22-04-2015
b. Sinoatrial nobe is the most important
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