Review Flashcards
(94 cards)
1
Q
Cell Membrane
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every cell
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Act as barrier between cells
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internal environment and
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5
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external surroundings
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6
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10 nanometer (thickness)
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7
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Functions of Cell Membrane
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8
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-
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Structure provides structural
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10
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support and helps maintain the cells
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shape
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Protection - protects the cell from
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13
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harmful substances in the
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14
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environment
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15
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Communication plays a critical
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16
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role in communication between cels
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the exchange of information and
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coordination of cellular activities
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Semi-permeability acts as a
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20
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selective barrier
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controlling what
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enters and exits the cell
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Gen Bio Rev
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Cell Membrane as Fluid Structure
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24
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- Has various components that
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constantly moving and
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interacting
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Composition of Cell Membrane
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Lipids 40%
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2 types of lipids are
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phospholipids & cholesterol
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Phospholipid Bilayer serves
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as the foundation of the cell
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membrane
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Proteins 50%
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Embedded within the
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phospholipids bilayer
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These proteins serve a wide
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range of functions
including:
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transport
receptors
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anchors and signals
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Carbohydrates 5%
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Combination of proteins and
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lipids
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Glycoproteins and Glycolipids
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Covers almost the entire outer
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Facilitated Diffusion
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- Movement of molecules with
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the aid of a transport proteins
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surface of the cel
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Transport Mechanism - the process
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of moving substances into and out
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of the cell through the cell
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membrane
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Factors that can Affect Membrane
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Transport
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• Membrane Permeability
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• Size and Charge of Solute
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• Solute Concentration
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Concentration Gradient - a
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disbalance in the distribution of
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particles of a substance
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Chemical Gradient
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Forms due to a difference in a
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solute concentration on
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different side of cell
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membrane
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Electrical Gradient
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23
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Forms due to a difference in
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charge on either side of a
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membrane
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Electrochemical Gradient
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Combines the effect of
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electrical and chemical
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gradient to determine the
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direction that ions will flow
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across a membrane
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Importance of Transport Mechanism
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to maintain stability and balance
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while adjusting that is best for
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survival. This process is also called
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as homeostasis
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1. Passive Transport - involves
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movement of materials through cell
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membrane without the use of
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energy
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Simple Diffusion
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When ions or molecules
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diffuse from an area of high
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concentration to area of low
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concentration
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molecules and waste out of a
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cell
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Receptor-mediated Endocytosis
