Human Biology, 14 Edition

Published by McGraw-Hill Education
ISBN 10: 1-25924-574-8
ISBN 13: 978-1-25924-574-9

Chapter 3 - Section 3.3 - The Plasma Membrane and How Substances Cross It - Check Your Progress: 3

Answer

Materials can enter the cell through endocytosis which is when a part of the plasma membrane forms a pouch to envelop the material and then pinches off into a vesicle inside the cell. When white blood cells take in pathogens through endodytosis it is called phagocytosis. When cells take in small molecules and fluid through endocytosis it is called pinocytosis. Molecules exit the cell through exocytosis which is when a molecule fuses with the plasma membrane and is secreted through the phospholipid bilayer.

Work Step by Step

Materials can enter the cell through endocytosis which is when a part of the plasma membrane forms a pouch to envelop the material and then pinches off into a vesicle inside the cell. When white blood cells take in pathogens through endodytosis it is called phagocytosis. When cells take in small molecules and fluid through endocytosis it is called pinocytosis. Molecules exit the cell through exocytosis which is when a molecule fuses with the plasma membrane and is secreted through the phospholipid bilayer.
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