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carbon monoxide
The red blood cells carry the oxygen in blood.
It is an iron-based protein called hemoglobin.
Because your cells need oxygen. Blood has Hemoglobins inside it, which carry oxygen.
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Hemoglobin gives the red blood cells the ability to carry oxygen.
Sickle cell anemia produces sickle-shaped RBCs that reduce the ability to carry as well as exchange oxygen with tissues.
carbon monoxide
Smoking can weaken the lungs and reduce breathing capacity. Also smoking can reduce oxygen level of blood thus blood can not carry enough oxygen to the necessary organ.
Lack of heamoglobin, lack of iron etc
Sickle Cell Anemia
Temperatures affect speed of metabolism, enzyme activity, and the blood's ability to carry oxygen.
Systemic Arteries carry oxygen rich blood (also called oxygenated blood). Pulmonary Arteries carry oxygen poor (deoxygenated) blood
By definition, ALL arteries carry Oxygen rich blood. Veins carry oxygen depleted blood.
The substance that makes it difficult for the blood to carry oxygen throughout the body is carbon monoxide. Carbon monoxide is also poisonous the cells in the body.
Veins carry oxygen depleted blood to the heart.
Usually veins carry blood low in oxygen back to the heart except for the pulmonary veins. They carry blood higher in oxygen.