O2 Transport

What is the primary role of oxygen in cells?

• It acts as a structural component of cell membranes.

• It is the essential fuel necessary for cells to stay alive and carry out activities.

• It serves as a signaling molecule for cellular communication.

• It is used primarily to synthesize cellular waste products.

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What percentage of dissolved oxygen in the blood is taken up by red cells?

• 100%

• 75%

• 98%

• 50%

How does oxygen initially enter the bloodstream?

• Through diffusion from the stomach lining after ingestion.

• Via osmosis through the skin directly into the blood vessels.

• By being taken up by blood flowing through capillaries in the lungs' alveoli.

• Through active transport mechanisms in the liver.

What is the function of hemoglobin in red blood cells?

• To filter out carbon dioxide from the blood.

• To provide energy for the red cells.

• To bind oxygen loosely and reversibly for transport.

• To increase the viscosity of blood.

What causes oxygen to move from the capillaries into the tissues?

• The higher partial pressure of oxygen in the tissues compared to the capillaries.

• The active transport of oxygen by tissue cells.

• The magnetic attraction between oxygen and cellular components.

• The lower partial pressure of oxygen in the tissues compared to the capillaries.

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What is oxyhemoglobin?

• Hemoglobin that is not saturated with oxygen.

• Hemoglobin that is fully saturated with oxygen.

• A plasma protein that transports oxygen.

• A type of white blood cell.

How does the oxygen dissociation curve of hemoglobin demonstrate its efficiency in oxygen transport?

• It shows a linear relationship between oxygen saturation and partial pressure.

• It illustrates how oxygen release to tissues occurs over a wide range of conditions.

• It indicates that hemoglobin can only transport oxygen under high pressure.

• It proves that hemoglobin transports oxygen more efficiently at lower temperatures.

1. Why do cells need oxygen?

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2. How do cells in the tissue get their O2?

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3. What is the function of the capillaries and the alveoli?

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