Cell Membrane

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Front (Term)

Fluid mosaic model

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Back (Definition)

A model that describes the structure of a cell membrane. In this model, a flexible layer made of lipid molecules is interspersed with large protein channels through with other molecules enter and leave the cell

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Front (Term)

Phospholipid

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Back (Definition)

A lipid containing a phosphate group in its molecule.

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Front (Term)

Simple Diffusion

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Back (Definition)

The passing of molecules directly through the cell membrane without energy along the concentration gradient.

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Passive transport

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Osmosis

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A process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one. Or the passing of water through the cell membrane

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Facilitated Diffusion

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Movement pf larger molecules and ions along the concentration gradient via the help of membrane proteins

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Active Transport

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The movement of molecules across a cell membrane in the direction against their concentration gradient.

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Bulk transport

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The movement of macromolecules such as proteins or polysaccharides into or out of the cell

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Exocytosis

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A process in which an intracellular vesicle moves to the plasma membrane and subsequent fusion of the vesicular membrane and plasma ensues.

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Endocytosus

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An energy using process by which cells absorb molecules by engulfing them. It is used by cells of the body because most substances important to them are large polar molecules that cannot pass through the hydrophobic plasma or cell membrane. Opposite process to expctosis

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Hypertonic

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When the concentration of water is higher inside of the cell rather than outside of the cell.

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Hypertonic

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When the concentration of water is higher inside of the cell rather than outside of the cell.

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Hypotonic

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When the concentration of water is higher outside of the cell rather than inside of the cell.

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Hypertonic

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When the concentration of water is higher inside of the cell rather than outside of the cell.

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Hypotonic

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When the concentration of water is higher outside of the cell rather than inside of the cell.

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Isotonic

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When the concentration of water is equal outside and inside of the cell

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Hypertonic

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When the concentration of water is higher inside of the cell rather than outside of the cell.

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Hypotonic

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When the concentration of water is higher outside of the cell rather than inside of the cell.

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Isotonic

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When the concentration of water is equal outside and inside of the cell

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Surface to volume ratio

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SA:V the amount of surface area per unit volume of an object or collection of objects. Measured in units of inverse distance