In facilitated diffusion, proteins provide openings in the plasma membrane for substances to flow through without changing structure, and proteins allow passage of substances through the plasma membrane after undergoing a subtle change in shape.

Answer: CHANNEL PROTEINS provide openings in the plasma membrane for substances to flow through without changing structure, and CARRIER PROTEINS allow passage of substances through the plasma membrane after undergoing a subtle change in shape.

Explanation: They are described thus:

A channel protein is a protein that allows the transport of specific substances across a cell membrane.

Carrier proteins are proteins that carry substances from one side of a biological membrane to the other. Many carrier proteins are found in a cell’s membrane, though they may also be found in the membranes of internal organelles such as the mitochondria, chloroplasts, nucleolus, and others.

In facilitated diffusion, __________ proteins provide openings in the plasma membrane for substances to flow through without changing structure, and __________ proteins allow passage of substances through the plasma membrane after undergoing a subtle change in shape.

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In facilitated diffusion, proteins provide openings in the plasma membrane for substances to flow through without changing structure, and proteins allow passage of substances through the plasma membrane after undergoing a subtle change in shape.