Does blood have oxygen when it enters the heart?

Answer 1

Every cell, tissue, muscle, etc. needs oxygen to perform its function. The heart is a smooth muscle which needs oxygen and circulates oxygen throughout the body.

When we breath out, the lungs release carbon dioxide. When we breathe in, oxygen molecules collect on small sacs in the lungs called aveoli. The aveoli look like upside-down groups of grapes, at the farthest ends of the bronchioles. As blood passes the aveloi, oxygen attaches to hemoglobin on red blood cells. The arteries push the blood through the heart to the brain...and to the major abdominal organs...then to the legs and feet...

All along the way, red blood cells "drop off" nutrients and oxygen to tissues through special processes within cells.

Then, from your legs, abdomen (ribcage to privates), arms, and your brain, capillaries return carbon dioxide and cell waste up through your body using special valves in the blood vessels (the valves only open one way - back toward the heart). The blood passes through the heart, to the lungs where it drops off carbon dioxide which you breathe out. At the same time, the kidneys act to filter certain waste products carried by venous blood (venous is non-oxygenated--- arterial is oxygenated). Although a heartbeat happens in a split second, with every heart beat the blood makes this continuous route out through your body and back.

As such, the respiratory system and cardiac system work in conjunction with each other all the time. If one of these fails, death can result. If one system becomes diseased, both systems begin to work harder to do the same jobs.

Answer 2

There are two circulatory paths through the heart: the pulmonary which goes to the lung where the blood takes up oxygen and releases carbon dioxide, and the systemic path which takes the oxygenated blood returning to the heart and sends it active tissues in the body (sends it everywhere but the circulation parcels it out). So the diplomatic answer is yes and no.

Answer 3

The heart receives blood from two "entrances". One is for oxygen-poor blood, coming from the entire body. The other is for oxygen-rich blood, coming from the lungs. The heart simply pumps the blood, and if the blood happens to be oxygen-poor, it will still continue to pump.

Answer 4

Yes. Every cell of a human body needs oxygen.

Answer 5

The heart does need a constant supply of oxygen to produce energy in the cardiac muscles to pump blood.

Answer 6

yes