Homeostasis & Cell Transport

19 terms by auerbacha

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MID TERMSSS!

endocytosis

process by which a cell takes in a substance by surrounding it with the cell membrane

Exocytosis

process by which a cell releases large amounts of material

Passive Transport

transport of a substance across a cell membrane by diffusion

Active Transport

the movement of materials through a cell membrane using energy

Hypertonic solution

a solution in which the concentration of solutes is greater than that of the cell that resides in the solution

Isotonic solution

in cells, solution in which the concentration of dissolved substances in the solution is the same as the concentration of dissolved substances inside a cell

hypertonic solution

a solution in which the concentration of solutes is greater than that of the cell that resides in the solution

Plasmolysis

when a cell is in a hypertonic environment, the cell will lose water to its surroundings, shrink, and its plasma membrane will pull away from the wall

Cytolysis

the rupturing of a cell due to excess internal pressure

Phagocytosis

process in which extensions of cytoplasm surround and engulf large particles and take them into the cell

Vesicle

A membrane bound sac that contains materials involved in transport of the cell.

concentration gradient

a difference in the concentration of a substance across a distance

Diffusion

process by which molecules tend to move from an area where they are more concentrated to an area where they are less concentrated

Osmosis

diffusion of molecules through a semipermeable membrane from a place of higher concentration to a place of lower concentration until the concentration on both sides is equal

Facilitated Diffusion

movement of specific molecules across cell membranes through protein channels

Sodium-Potassium Pump

Cotransporter that actively moves sodium out of a cell and passively moves potassium into it.

Phospholipids

lipid that has a phosphate group replacing one of the fatty acids,
A molecule that is a constituent of the inner bilayer of biological membranes, having a polar, hydrophilic head and a nonpolar, hydrophobic tail.

Carrier Protein

a protein that transports substances across a cell membrane

Gated ion channel

A gated channel for a specific ion. When ion channels are opened or closed, the membrane potential of the cell is altered.

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