B. Facilitated

Molecules move across the membrane


Movement of glucose through a cell


through channels or by carrier molecules from a region of higher concentration to one of lower concentration.



C. Osmosis

Water molecules move from regions of higher concentration toward regions of lower concentration through a selectively permeable membrane.

Molecular motion

Distilled water entering a cell

D. Filtration

Smaller molecules are forced through porous membranes from regions of higher pressure to regions of lower pressure.

Hydrostatic pressure

Molecules leaving blood capillaries

II. Active (Physiological) Processes

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Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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