The oxygen poor blood (not enough oxygen) goes to the lungs to get more oxygen to turn into oxygen rich blood (has plenty of oxygen)
They circulate and oxygenate the blood.
Blood only travels one way. Away from the heart to the body and lungs and back from the body and the lungs to the heart.
Then your lungs can't provide oxygen or nutrients to the blood that the heart pumps out to other parts of the body.
it needs to
circulate blood
how does the blood circulate Put simply the heart is a pump, I don't know much more about it than that.
The flow of blood from the heart to the lungs and back to the heart is called the pulmonary circulation.The blood flowing from the heart to the lungs would be deoxygenated and blood flowing towards the heart from the lungs would be oxygenated.
The pulmonary artery carries blood from the heart to the lungs
CPR involves compressing the heart (by compressing the chest) forcing the heart to pump blood when it is not beating. AR- artifical respiration- only pushes air into the lungs. It does not circulate oxygenated blood in the body.
heart contractions
The blood vessels of an embryo are connected to both the heart (internally) and the umbilical cord (externally). The heart beats and helps circulate the blood to some degree but mostly it is the heart of the mother that helps circulate the blood to and from the embryo.
Salamanders are amphibians . All amphibians possess incomplete double circuit heart. They have two atria and one ventricle . Spiral valve helps in shunting blood . Pulmonary arteries carry blood to lungs ans skin for oxygenation . Heart pumps blood .