Question

In: Biology

Consider the concentration gradients of oxygen and carbon dioxide to determine their direction of movement at...

Consider the concentration gradients of oxygen and carbon dioxide to determine their direction of movement at the alveoli of the lungs.

Select the true statement.

Oxygen moves down its concentration gradient from the lungs to the blood. Carbon dioxide moves down its concentration gradient from the lungs to the blood.

Oxygen moves down its concentration gradient from the lungs to the blood. Carbon dioxide moves down its concentration gradient from the blood to the lungs.

Oxygen moves down its concentration gradient from the blood to the lungs. Carbon dioxide moves down its concentration gradient from the lungs to the blood.

Oxygen moves up its concentration gradient from the lungs to the blood. Carbon dioxide moves up its concentration gradient from the lungs to the blood.

Oxygen moves up its concentration gradient from the lungs to the blood. Carbon dioxide moves up its concentration gradient from the blood to the lungs.

Solutions

Expert Solution

  • The true statement is the second statement - Oxygen moves down its concentration gradient from the lungs to the blood. Carbon dioxide moves down its concentration gradient from the blood to the lungs.
  • The remaining statements are false. Let us analyse them one by one.
  • In the first statement, the part "Carbon dioxide moves down its concentration gradient from the lungs to the blood" is false. Carbon dioxide moves down its concentration gradient from blood to the lungs in order to be breathed out.
  • In the third statement both the parts of the statement is wrong.Oxygen moves down its concentration gradient from the lungs to the blood. Carbon dioxide moves down its concentration gradient from the blood to the lungs.
  • In the fourth and fifth statements, the mistake is that none of the gases move up their concentration gradient. This is because, the gaseous exchange occurs by diffusion and the primary rule of diffusion is that the gases always move down their concentration gradient.

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