Bulk flow is completely independent of diffusion; diffusion does not occur anywhere in the body of an organism that demonstrates bulk flow.

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Quizplus · Accepted Answer

In some organisms or tissues, both bulk flow and diffusion can occur simultaneously. For example, in the lungs, bulk flow brings air into and out of the alveoli, while diffusion occurs between the alveoli and the surrounding capillaries. Similarly, in plants, bulk flow occurs in the xylem for long-distance water and nutrient transport, while diffusion occurs in the mesophyll cells for the exchange of gases during photosynthesis.

Bulk Flow Is Completely Independent of Diffusion; Diffusion Does Not