Question

(i) name the blood vessel that brings oxygenated blood to the human heart. (5 marks) (ii) which chamber of human heart receives oxygenated blood? (iii) explain how oxygenated blood from this chamber is sent to all parts of the body.

Answer 1

i pulmonary vien
ii the left atrium 
iii the blood enters in left atrium as it relax then it contracts when left ventricle relax so blood moves in left ventricle then it also contract to pump the blood to rest of the body. This is how oxygenated blood is pumped to different parts of the body there are valves which prevent blood from moving back.