How The Cardiovascular System works

It’s made of two separate circuits and the blood passes through the heart twice. The pulmonary circuit carries blood to the lungs where carbon dioxide is removed from the blood, and oxygen is taken up by the haemoglobin in the red blood cells and then back to the left side of the heart.

The systemic circuit carries blood around the body to deliver the oxygen and returns waist material and de-oxygenated blood, blood that contains carbon dioxide, to the heart in the right side.

The tricuspid valve and the pulmonary valve on the right side of the heart, and the mitral valve and the aortic valve on the left act as gates that open and close, to make sure that the blood travels in one direction through the heart. The top of the heart connects to the great blood vessels of the body, the aorta on the left side that delivered the oxygenated blood to the body, vena cava that transport the deoxygenated blood in the lungs and pulmonary trunk that origins from the right side and then it branches in the right and left pulmonary arteries that are connected then to the lungs, they carries the low oxygenated blood to the lungs, and pulmonary veins transfer oxygenated blood from the lungs to the heart.

The heart pumps blood that contain the digested food, water, red blood cell that carry oxygen from the lungs, hormones from the varies glans, energy heat, white blood cell and the antibodies, from the left side, through the aorta, the main artery of the heart, into the arteries. The blood travels through the arteries, into smaller branches of blood vessels, the capillaries. Through this network of capillaries, blood reaches every part of your body to give all the necessary nutrients from the cell and get beck through the veins the waist product of the cellular respiration.

The de-oxygenated blood, then travels back to the heart through your veins. Branches of veins join to form larger veins, that go back to the right side of the heart through the vena cava.

Then the heart pumps the de-oxygenated blood to lungs. As the heart relaxes in between each contraction, blood from the veins fills the right side of the heart. At the same time, blood that gets oxygen from the lungs fills the left side ready to enter the aorta and to start again the whole process.