Which parts of the body help to make up the first line of defense for your immune system ? a. white and red blood cells

b. Skin, breathing passages, mouth and stomach

c. T & B cells

d. Memory cells and antibodies

Cells a and b are the same size and shape, but cell a is metabolically quiet and cell b is actively consuming oxygen. oxygen will diffuse more quickly into cell because . b the oxygen molecules inside cell b have a higher kinetic energy b. a its membrane transport proteins will not be saturated c. a the diffusion gradient there is shallowerd. b the diffusion gradient there is steeper