Simple diffusion occurs when compounds like carbon dioxide that cross the membrane with the concentration gradient.

Simple Diffusion

Larger molecules that cannot pass the membrane from passive diffusion require channels to help them move. This occurs through facilitated diffusion.

Facilitated Diffusion

Osmosis is the passive diffusion of water. Water passes the membrane to where there is a lower concentration of water. This does not require energy. Osmosis can causes stress and pressure on cells depending on the environment. 

Osmosis

- simple diffusion
- facilitated diffusion
- osmosis

University of Wisconsin - Madison

Passive transport is when compounds move with the concentration gradient. They move from a higher to lower concentration. Passive transport does not require energy to transport molecules.

Passive Transport

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Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

Microbiology is produced through a collaborative publishing agreement between OpenStax and the American Society for Microbiology Press. The book aligns with the curriculum guidelines of the American Society for Microbiology.

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