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Nutrition Science and Everyday Application - beta v 0.1

Nutrition Science and Everyday Application - beta v 0.1

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PROTEIN FUNCTIONS 327<br />

A YouTube element has been excluded from this version of the text. You can view it online here: https://openoregon.pressbooks.pub/<br />

nutritionscience/?p=468<br />

VIDEO: “The Sodium-Potassium Pump,” by Ricochet<strong>Science</strong>, YouTube (May 23, 2016), 2:26 minutes.<br />

This tutorial describes how the sodium-potassium pump uses active transport to move sodium ions<br />

(Na+) out of a cell, <strong>and</strong> potassium ions (K+) into a cell.<br />

IMMUNITY<br />

Proteins also play important roles in the body’s immune system. The strong collagen fibers<br />

in skin provide it with structure <strong>and</strong> support, but it also serves as a barricade against harmful<br />

substances. The immune system’s attack <strong>and</strong> destroy functions are dependent on enzymes<br />

<strong>and</strong> antibodies, which are also proteins. For example, an enzyme called lysozyme is secreted

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