BMS 108 Ch. 03 Cell Structure Flashcards
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What is another name for the plasma cell membrane?
Phospholipid bilayer
What are the three main components of cells?
Plasma membrane, cytoplasm and nucleus
What molecules are restricted from passing through the plasma cell membrane?
Polar, large, ions, most amino acids, proteins and glucose
What gets through the plasma cell membrane?
nonpolar, small, lipids, steroids, gases and *H2O
What is the fluid mosaic model of the plasma cell membrane?
The phospholipid bilayer is a sea with a constantly changing mosaic pattern.
What functions do proteins in the plasma membrane serve?
structural support, transport of molecules across the membrane, and enzymatic control of chemical reactions at the cell surface.
What is bulk transport?
a way cells move large molecules and particles across the plasma membrane.
What is phagocytosis?
one way for a cell to take in particulate matter
What is endocytosis?
another way to take large compounds into a cell; a way to make vesicles
*the membrane invaginates to take in a vesicle of extracellular substance
What is Pinocytosis?
A non-specific endocytosis
What is a specific endocytosis called?
Receptor Mediated Endocytosis
Cells use _______ to export products into the extracellular fluid by bulk transport via secretory vesicles.
Exocytosis
What is cilia?
moving projections from the cell that help move fluids over the plasma cell membrane
What is a flagella?
a projection from the cell that propels the cell (human sperm)
What is the function of microvilli?
To increase rate of absorption by increasing cell surface area.
What is cytoplasm?
The jellylike matrix within a cell consisting of cytosol and organelles.