Anyone know wha tthey mean?

Question

Deoxygenated Blood

Circulatory System:

Pulmonary Circulation:

Systemic Circulation:

Coronary Circulation:

Answer 1

they all have to do with the heart and circulation of blood.

Answer 2

One of the major functions of blood is to deliver oxygen to the tissues. It does so using hemoglobin in the red blood cells to comibine with oxygen in the lungs. Normally, over 90% of the hemoglobin is saturated with oxygen as it leaves the lungs, passes through the pulmonary veins back into the heart, and is sent to the periphery. There, the various organs and tissues take up some of this oxygen and give up carbon dioxide, which also combines with hemoglobin, for transport back to the heart and then the lungs, where it's exhaled. The blood returning in the veins is not completely without oxygen, but it is relatively deoxygenated.

The pulmonary circulation begins with the deoxygenated blood being sent back to the lungs via the pulmonary arteries, and ends with the freshly oxygenated blood being returned to the heart via the pulmonary veins. The systemic circulation is the bulk of the entire circulatory system. It starts with the aorta as it leaves the heart, transports the blood to the head, the toes, and everything in between. It ends with the vena cava returning the deoxygenated blood to the heart.

The coronary circulation supplies the (oxygenated) blood to the muscle of the heart itself. You might think the heart could just absorb oxygen directly from the blood inside its chambers, but it doesn't work that way. The right and left main coronary arteries and their branches are on the outside surface of the heart and the progressively smaller branches penetrate into the muscle to give it a good supply. The coronary circulation is a bit different from the others in that the pulmonary and systemic arteries have the blood squished into them by the contraction of the heart, systole. The coronary circulation, though, is backwards: the contraction of the heart stops the coronary circulation and the blood flows into those vessels during diastole, when the heart muscle is relaxed. This makes sense if you think about it.