It puts a strain on the heart because of all the extra miles of blood vessels it has to pump through.
Well blood need to transport ( carry) nutrients and blood around the body . If your organs don't receive nutrients they will weaken.
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There will never be any mixing of oxygen-rich blood and oxygen-poor.
blue color for veins, means poor oxygened blood from the system to the heart and red for arteries means rich oxygened blood from the heart toward the system.
Poor nutrition.
When a person has poor nutrition they open themselves up to Vitamin deficiencies, which effect the eyes, bones, hair, immune system, skin, digestion, body cells, liver, and the list goes on! Your bodies ability to heal is effected if you don't have the necessary materials to heal, chemical and hormonal imbalances can occur. These things all put a person at higher health risk. If your body doesn't have the right nutrients or energy sources, your system will fail.
Circulatory system equals blood. People with poor circulation lose limbs because the tissue can't get oxygen and other essential nurtients and lymph for regulation. So, yes. Very nessesary. People die without hearts!
Malnutrition
valves keep blood from flowing back into the heart and help pump oxygen-poor blood back to the heart.
The pulmonary arteries carry oxygen poor blood to the lungs.
It works with all other systems . All systems in body are coordinated . The digestive system provides energy. The skeletal system protects it. Nervous system sends the signals. Circulatory system takes the oxygen rich blood and takes the oxygen poor blood back. The muscular system moves it. The immune system fights against diseases and protects it from sicknesses.
Poor nutrition.
Malnutrition