By what process does oxygen move from the alveoli into the blood of the pulmonary capillaries?

Diffusion

Explanation:

Diffusion is a simple process of molecules' movement, from their higher concentration to he area with their lower concentration. The process of oxygen movement from the alveoli into the blood of the pulmonary capillaries is called gas exchange and it is actually simple diffusion. Alveoli have huge surface area, thin cell walls and a lot of blood vessels around them. All of these are adaptations that facilitate gas exchange. There is a high oxygen gradient:  oxygen concentration in the alveoli is much higher (inhaled air) than in the surrounding capillaries so oxygen moves down its gradient-from the alveoli to the blood.

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.