Role of Diffusion Intense
physical activity requires a rapid exchange of O₂ and CO₂ between the
atmosphere and the body's cells. O₂ is essential for cellular respiration,
which produces the energy needed for muscle function. A higher heart rate means
faster oxygen delivery to tissues and more efficient carbon dioxide removal.

Red
blood cells (RBCs) are responsible for oxygen transport because they contain hemoglobin,
a protein that binds O₂. However, before oxygen can bind to hemoglobin, it must
first enter the RBC.

Looking
at the images, which of the following statements are correct?

Question

Role of Diffusion Intense
physical activity requires a rapid exchange of O₂ and CO₂ between the
atmosphere and the body's cells. O₂ is essential for cellular respiration,
which produces the energy needed for muscle function. A higher heart rate means
faster oxygen delivery to tissues and more efficient carbon dioxide removal.

Red
blood cells (RBCs) are responsible for oxygen transport because they contain hemoglobin,
a protein that binds O₂. However, before oxygen can bind to hemoglobin, it must
first enter the RBC.

Looking
at the images, which of the following statements are correct?

Answer

The cell membrane is usually not permeable to
oxygen. Hemoglobin causes the cell membrane to become permeable to oxygen,
enabling faster diffusion into the red blood cells.

Answer

Oxygen
diffuses into red blood cells, where it binds to hemoglobin, lowering free
oxygen levels inside the cell. This keeps a strong concentration gradient,
allowing more oxygen to enter. As RBCs take up oxygen, the gradient between air
and blood stays high, ensuring efficient oxygen transfer from the lungs.

Answer

Oxygen binds to hemoglobin and enters the
RBCs, and this creates a concentration gradient between oxygen in the air vs
oxygen in the blood.

Answer

Hemoglobin
is a protein that has a heme group to which oxygen binds.

Answer

Oxygen can freely diffuse through the cell
membrane of the RBC and the binding to hemoglobin is not helpful in
establishing the concentration gradient between oxygen in the air and oxygen in
the blood

Answer

The cell membrane of the RBC is not permeable
to oxygen, and it needs the help of transport proteins, and thus hemoglobin
plays a role.

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Role of Diffusion Intense physical activity requires a rapid exchange of O₂ an...

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