Reading Guide: 4-2 ...........................................................Name __________________________________

1. The transport of a substance across the cell membrane against its concentration gradient is called _____________________________________________

2. Carrier proteins in active transport functions as ___________________ to move substances against the concentration gradient.

3. Put the following in the correct order
______ Pump changes shape and released 3 sodium ions outside the cell
______ Two potassium ions are released inside the cell
______ Three sodium ions bind to the sodium-potassium pump
______Two potassium ions bind to the pump

4. Which of the following could happen if the sodium potassium pump stopped working (check all that apply)
______ The cell would not get enough sodium
______ The cell could burst
______ Potassium would build up inside the cell
______ The cell might have difficulty transporting glucose

5. [ Endocytosis / Exocytosis ] moves substances to the inside of the cell.

6. During endocytosis, a pouch is formed, this pouch is called a ________________________

7. Membrane Receptor Proteins Receive ________________________

8. You body's cells must communicate with each other to _________________________ growth, metabolism, and other activities.

9. A receptor protein is a protein that binds to a ____________________________

10. When a signal molecule binds to the receptor protein (fig 4-8) the ion channel [ opens / closes ]

11. Some drugs, like heroin imitate _______________________________

123. Beta blockers keep the heart rate from [ increasing / decreasing ]

13. (See Health Watch, page 86) Myasthenia gravis is a disease characterized by abnormal _____________________ and severe muscle _____________________
14. In a person with MG, the immune system attacks receptor proteins on ___________ cells

1. The picture represents both active and ___________________transport.
2. The ______________________-potassium pump removes _____ sodium ions while taking in ______ potassium ions
3. Active transport involves the use of ___________, or energy.
4. The black circles in the diagram represent _____________________________________
5. Carrier proteins are used in ______________________ transport and do not require the cell to expend energy. This type of diffusion is called __________________________________ diffusion.
6. Which area represents passive transports (A, B or C) ________________
7. Glucose moves [ against / with ] the concentration gradient.
8. Name two molecules that move across the membrane by diffusion: ____________________ and ____________________________
9. Which area of the diagram shows the phospholipid bilayer (A,B, or C) ___________________
10. One would expect the concentration of sodium to be [ higher / lower ] inside the cell.