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Homeostasis and Cell Transport

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Presentation on theme: "Homeostasis and Cell Transport"— Presentation transcript:

1 Homeostasis and Cell Transport
Vocabulary Review Homeostasis and Cell Transport

2 The movement of substances across a cell membrane without any input of energy
Passive Transport

3 The movement of molecules from an area of higher concentration to an area of lower concentration

4 The difference in the concentration of molecules across a distance
Concentration gradient

5 Concentration of molecules is the same throughout the space the molecules occupy

6 Movement of water molecules from high concentration to low concentration

7 Concentration of solute molecules outside the cell is LOWER than in the cytosol; water diffuses into the cell Hypotonic

8 Concentration of solute molecules outside the cell is HIGHER than in the cytosol; water diffuses out of the cell Hypertonic

9 Concentrations of solutes outside and inside the cell are equal

10 Organelles that remove water through contraction
Contractile Vacuoles

11 The pressure that water molecules exert against the cell wall
Turgor pressure

12 The shrinking of a cell due to water’s moving out the cell when placed in a hypertonic environment

13 The swelling and eventual bursting of a cell as water moves into it when placed in a hypotonic environment Cytolysis

14 Facilitated Diffusion
The movement of substances across a cell membrane with the assistance of protein carriers Facilitated Diffusion

15 The proteins that move certain molecules into the cell that cannot readily diffuse through the cell membrane Carrier Proteins

16 A complex of protein molecules in a cell membrane that form a pore through which ions can pass
Ion Channels

17 The movement of chemical substances, usually across the cell membrane, against a concentration gradient; requires energy Active Transport

18 Sodium-Potassium Pump
A carrier protein that uses ATP to actively transport sodium ions out of a cell and potassium ions into the cell Sodium-Potassium Pump

19 The process by which a cell membrane surrounds a particle and encloses the particle in a vesicle to bring the particle into the cell Endocytosis

20 Small cavity or sac that contains materials; forms when part of the membrane surrounds the materials to be taken into or out of the cell Vesicle

21 A method of active transport across the cell membrane in which the cell takes in extracellular fluids Pinocytosis

22 The process by which a cell engulfs large particles or whole cells, either as a defense mechanism or as a means to obtain food Phagocytosis

23 A cell that ingests and destroys (digests) foreign matter or microorganisms

24 The process by which a substance is released from the cell through a vesicle that transports the substance to the cell surface and then fuses with the membrane to let the substance out Exocytosis

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