The reason should be explained why K + , Na + , Ca 2+ , and Mg 2+ do not cross biological membranes by simple diffusion. Concept Introduction: The process by which the molecules are able to pass through the membrane without interacting with the components of the membrane is said to be simple diffusion.

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Chapter 20, Problem 54P

Interpretation Introduction

Interpretation: The reason should be explained why K+, Na+, Ca2+, and Mg2+ do not cross biological membranes by simple diffusion.

Concept Introduction: The process by which the molecules are able to pass through the membrane without interacting with the components of the membrane is said to be simple diffusion.

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