The blood with high oxygen content enter the heart in left atrium through right and left pulmonary veins, combined together.
right atrium
pulmonery veins
oxygen enters the blood and carbon dioxide
The function of the respiratory system is to provide the body with oxygen. Oxygen enters the body through the respiratory system and is carried in blood throughout the body.
Oxygen enters the blood in the alveoli. The alveoli are little bumpy ball like things at the end of bronchioles in the lungs.
There are two types of circulations, known as lesser and greater circulation. They are placed in series. say blood enters in right atrium through superior and inferior vena cave. Then it enters right ventricle. Then it passes to lungs, via pulmonary trunk. After purification from here it goes to left atrium. From it goes to left venrticle. From left ventricle it goes to all the body, but lungs. then from superior and inferior vena cave it again enters the left atrium.
a little oxygen and a lot of carbon dioxide
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Oxygen enters the blood in the alveoli of the lungs
Blood entering the left ventricle is rich in oxygen. In contrast, oxygen-poor blood enters the right ventricle.
Oxygen enters the blood in the alveoli of the lungs
Oxygen enters the pulmonary blood in the capillaries of the alveoli -- the air sacs of the lungs.
Oxygen-poor blood enters the heart through the right atrium
blood oxygen
the lungs
Oxygen
blood
Oxygen
When blood that is rich in oxygen re enters the heart, the blood enters through the pulmonary valve. The pulmonary valve brings the oxygen rich blood to the pulmonary trunk of the pulmonary artery.