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48.9 Mechanisms of Gas Transport in Blood
The shape of the dissociation curve is changed by each subunit.
How CO is transported is examined.
Oxygen binding to iron atoms is reversibly done within erythrocytes, whereas the heme portion of hemoglobin is not.
hemoglobin has a quaternary structure that allows it to bind to oxygen.
The iron metal is found in heme groups in many marine animals.
The atoms that bind oxygen are called hemoglobin.
When P is low, fewer O molecule will be bound.
O2 is part of the heme group.
A molecule of O can bind.
They are ideal for transporting O.
All of them have a globin that is close to 100% saturated with O.
The reversibility of O binding allows metabolism.
O2 respiratory pigments are used to deliver O to cells.
The other parts of the body are usually around 40mmHg.
The cise hemoglobin releases more O and becomes less saturated when HbO is oxyhemoglobin.
The amount of pigment in the blood is enough to bind O and release it.
The shape results from the fact that the blood carries 45 times more O than it would without the presence of hemoglobin.
When they are metabolizing food, the O2 lungs are nearly all Fe2+.
The saturation of hemoglobin in the O capillaries is higher than in the other tissues.
The more metabolismally active a tis is, the more blood flow it receives, which means more hemoglobin, as in the rest of the body tissues.
This is an excellent example of how adaptive changes in circulatory and respira tory functions often complement each other.
The curve from is in larger animals.
The curve levels off at high phant have shifted to the left compared to humans.
The oxygen-hemoglobin binding oxygen at a resting rate is remarkable.
The mouse has less oxygen bound relationship with it than does the human because it is influenced by waste products such as CO and H+.
The mouse has released more of its blood in the presence of low or high levels of CO.
The active tissues have more carbon dioxide in them than other animals.
This is an example of allosteric regulation, as described in Chapter changes in the genes.
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