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Transcript
CHAPTER 7 HOMEOSTASIS AND TRANSPORT Worksheet 1. A type of transport in which water moves across and down its concentration gradient is called ______________________________________. 2. Net movement of water across a cell membrane occurs from a ___________________ solution to a ________________________ solution. 3. A _____________________ ___________________ only allows certain molecules to pass thorough. 4. A __________________________ _____________________ is the concentration difference across space. 5. A structure that can move excess water out of a unicellular organism is a __________________________ ______________________. 6. The movement of some substances, without any input of energy by the cell, is called ________________________ ________________________. 7. The process of diffusion requires________________________________________________ ___________________________________________________________________________. 8. If the molecular concentration of a substance is the same throughout space, the substance is in ____________________________________. 9. All forms of passive transport depend on the ___________________ ________________ of molecules. 10. The movement of molecules from an area of higher concentration to an area of lower concentration is called ______________________________. 11. Sodium-potassium pumps move ___________________ ions _______________ of the cell and ___________________________ ions ___________________ the cell. This causes the inside of the cell to have what type of charge? __________________________. 12. Most of the time, the environment that plant cells live in is ________________________. 13. Plasmolysis of a human red blood cell would occur if the cell were in a(n) ____________________________ ____________________________. 14. The bursting of cells is called _____________________________. 15. The pressure that water molecules exert against a cell wall is called ___________________ _________________________________. 16. A membrane bound organelle used in endocytosis is called a _______________________. 17. A relatively high solute concentration is called _____________________________. 18. The uptake of large particles is called ________________________________. 19. The shrinking of cells is called _____________________________________. 20. A relatively low solute concentration is called ___________________________. 21. The uptake of solutes or fluids is called ________________________________. 22. Molecules always diffuse ___________________ their concentration gradient. 23. The diffusion of water across a membrane is called __________________________. 24. In an ________________________ _____________________ the concentration of solutes outside and inside the cell are equal. 25. Transport that requires the cell to expend energy is called _____________________ ________________________________. 26. Which type of molecule forms a bilayer within a cell membrane? __________________________________ 27. Most food and wastes materials that move into and out of a cell go through ____________________________ ________________________________. 28. Glucose molecules cross the cell membrane by means of ______________________________ _______________________________. 29. Ridding the cell of material by discharging it from sacs (vessicles) at the cell surface is called ____________________________________________________. 30. Molecules that are too large to be moved across a cell membrane can be removed from the cell by ________________________________________________. 31. A substance that dissolves in another substance is called a (n) _________________________________________. 32. The diffusion of ___________________________ through the cell membranes is called osmosis. 33. When water enters the cell, it creates pressure. This pressure is called _____________________________ _______________________________________________. 34. A cell does not expend __________________________ when diffusion takes place. 35. __________________________ is the most common solvent in cells. 36. A cell membrane is said to be _______________________________________ permeable because it allows the passage of some solutes and not others. 37. Facilitated diffusion and active transport are two types of ________________________________ transport. 38. __________________________ _______________________________ allows a cell to stockpile substances in far greater concentrations that they occur outside the cell. 39. Active transport systems are a form of cell transport that requires energy from molecules of __________________________________________________. 40. The process in which an amoeba engulfs its prey and takes it in is known as _______________________________________________________________.