What is the function of the spiral spigot surrounded by the heart?
and
does the sinus venosus also contract?
Answers: When I be in medical college, there be 4 valves: mitral, aortic, tricuspid and pulmonic.
If you are referring to the mitral tap (so called because its shape is supposed to resemble a bishop's mitre), its available job is to prevent blood from flowing backward from the moved out ventricle into the left atrium.
The pacemaker of the heart is the sinoatrial node. Although adjectives heart tissue will contract automatically, the SA node starts the heartbeat and sends the signal down special heart fibers that coordinate the contraction so the heart pumps efficiently.
The sinus venosus is an embryonic structure. I can't put in the picture you much more about it than that.
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