Question

Oxygen, a small nonpolar molecule, crosses cell membranes from the blood into interstitial fluid by: A....

Oxygen, a small nonpolar molecule, crosses cell membranes from the blood into interstitial fluid by:

A.

endocytosis
B.

pinocytosis
C.

diffusion
D.

active transport
Science   Anatomy-And-Physiology   
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Answer #1

Answer

Oxygen, a small nonpolar molecule, crosses cell membranes from the blood into interstitial fluid by : Diffusion

  • Diffusion is the process by which small and non polar molecules can easily move across the plasma membrane.
  • Oxygen moves by diffusion from the place of higher oxygen concentration to the place of lower oxygen concentration.
  • In lungs, oxygen moves into pulmonary capillaries and in tissues oxygen moves from systemic capillaries into the tissue cells.

Option C

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