At body temperature, the solubility of oxygen in water is approximately 0.025 cm 3 of oxygen per cm 3 of water. Assuming that the blood plasma is mostly water, how much oxygen could be carried in 1 dm 3 of blood if there was no haemoglobin?

The transport of gases in the body occurs through the blood, the exchange of materials takes place through the thin blood vessels called capillaries. We know that, 1dm = 10 cm Given that the solubility of oxygen in water is approximately 0.025 cm 3 of oxygen per cm 3 of water. If we assume that there was no haemoglobin in the blood and assume that the blood plasma is mostly water then the oxygen carried in 1 dm 3 of blood = 0.025 * 10 = 0.025 dm = 00.0025 dm 3 .

Use the given dissociation curve in the given figure and answer the question: If 1 gm of fully saturated haemoglobin is combined with 1.3 cm 3 of oxygen, how much oxygen will 1 gm of haemoglobin in the capillaries in the lungs be combined with?

One molecule of haemoglobin can combine with eight oxygen molecules. In the pulmonary capillaries, the haemoglobin is almost fully saturated (98%) with oxygen due to the high partial pressure of oxygen in the lungs. So the saturation of haemoglobin in the lung capillaries will be almost equal to 1.3 cm 3 .

Use the given dissociation curve in the given figure and answer the question: How much oxygen will 1 gm of haemoglobin in the capillaries of this muscle be combined with?

One molecule of haemoglobin can combine with eight oxygen molecules. In the respiratory tissues like muscles, the partial pressure of oxygen is low while in the capillaries that bring blood from the lungs the PO 2 is high. The haemoglobin loses oxygen into the tissues (muscles) haemoglobin. As the haemoglobin reaches the muscles, it releases around three-quarters of the oxygen bound to it. Thus, we can say that the saturation of haemoglobin in the tissues will be almost equal to one-third of 1.3 cm 3 (0.43 cm 3 )

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In a healthy adult human, there is about 150 gm of haemoglobin in 1 dm3 of blood. 1 gm of haemoglobin combines with 1.3 dm3 of oxygen at body temperature. Calculate how much oxygen can be carried by 1dm3 of blood.

Important Questions on Transport in Mammals

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Biology for Cambridge International AS & A Level coursebook 2nd Edition Digital Access>Chapter 8 - Transport in Mammals>Questions>Q 11

At body temperature, the solubility of oxygen in water is approximately 0.025 cm³ of oxygen per cm³ of water. Assuming that the blood plasma is mostly water, how much oxygen could be carried in 1 dm³ of blood if there was no haemoglobin?

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Biology for Cambridge International AS & A Level coursebook 2nd Edition Digital Access>Chapter 8 - Transport in Mammals>Questions>Q 12

Use the given dissociation curve in the given figure and answer the question:

The partial pressure of oxygen in the alveoli of the lungs is about 12kPa. What is the percentage saturation of haemoglobin in the capillaries in the lungs?

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Biology for Cambridge International AS & A Level coursebook 2nd Edition Digital Access>Chapter 8 - Transport in Mammals>Questions>Q 12

Use the given dissociation curve in the given figure and answer the question:

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If 1 gm of fully saturated haemoglobin is combined with 1.3 cm³ of oxygen, how much oxygen will 1 gm of haemoglobin in the capillaries in the lungs be combined with?

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AS and A Level

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Biology for Cambridge International AS & A Level coursebook 2nd Edition Digital Access>Chapter 8 - Transport in Mammals>Questions>Q 12

Use the given figure and answer the question:

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The partial pressure of oxygen in an actively respiring muscle is about 2 KPa. What is the percentage saturation of haemoglobin in the capillaries of such a muscle?

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Biology for Cambridge International AS & A Level coursebook 2nd Edition Digital Access>Chapter 8 - Transport in Mammals>Questions>Q 12

Use the given dissociation curve in the given figure and answer the question:

Question Image

How much oxygen will 1 gm of haemoglobin in the capillaries of this muscle be combined with?

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Biology for Cambridge International AS & A Level coursebook 2nd Edition Digital Access>Chapter 8 - Transport in Mammals>Questions>Q 13

Build up a list of three ways that the haemoglobin is related to its function as an oxygen transport molecule in the blood. Give a brief explanation of how the structure of haemoglobin helps it to carry out its functions.

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Biology for Cambridge International AS & A Level coursebook 2nd Edition Digital Access>Chapter 8 - Transport in Mammals>Questions>Q 14

The following statement was made by candidate in an examination answer. Explain what is wrong with this statement.

Oxyhaemoglobin gradually releases its oxygen as it passes from the lungs to a muscle.

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Biology for Cambridge International AS & A Level coursebook 2nd Edition Digital Access>Chapter 8 - Transport in Mammals>Questions>Q 14

The following statement was made by candidate in an examination answer. Explain what is wrong with this statement.

Strong walls of the arteries enable them to pump blood around the body.

In a healthy adult human, there is about 150 gm of haemoglobin in 1 dm3 of blood. 1 gm of haemoglobin combines with 1.3 dm3 of oxygen at body temperature. Calculate how much oxygen can be carried by 1dm3 of blood.

Important Questions on Transport in Mammals

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