how our blood pump in the heart explain
Answers
our heart has four chambers two upper right and left atria and two lower left and right ventricles
sino atrial node is responsible to initiate exitation of heart or contraction thus it is auto exitable myogenic heart
NOW sino atrial node is present in slight right side in upper right atrium
a patch of this tissiue is present in lower right atrium which futher exand all over as purkinje fibres called bundle of his
now a tricupsid valve is present btween right atrium and right ventricle whereas bicupsid valve is present in left atrium and left ventricle
now vena cava releses blood into right atrium on contraction by SAN the blood goes into right vetricle by tricupsid valve when this ventricle contracts the blood pumps into pulmunary artery throgh semilunar valve (valves prevent backflow of blood) then blood reches to lungs after getting oxygen blood enters into left atrium throgh pulmunary vein then atria pumps blood into left ventricle from where it is pumped into arteries(now blood is oxygenated) arteries transport this oxygenated blood to all tissues throgh arteries cappilaries artioles and deoxygeated blood collected in veins which again releses into right atrium of heart
i hope you would get help with this