Exam 5: Membrane Dynamics

The two extracellular compartments in the body are ________ and ________.

Carrier proteins operating at their maximum rate are said to be ________.

The walls of the ________ separate the two extracellular fluid compartments.

Which of the following is NOT involved in creating the resting potential of a neuron?

The membrane proteins that catalyze reactions that take place on the external or internal surface of the cell are ________.

Explain how the body can be in a state of osmotic equilibrium and chemical disequilibrium.

Explain the process of secondary active transport and how it uses ATP.

If a 10% sucrose solution is separated from a 20% sucrose solution by a membrane permeable to sucrose,in which direction will net diffusion of sucrose take place?

Match the terms to changes presented,assuming a resting membrane potential of -70 mV.Answers may be used once,more than once,or not at all. -to -90 mV from resting potential

Match the transport process to its description. -the movement of molecules from an area of high concentration to an area of low concentration

Voltage-gated (voltage-dependent)channels and antiport carriers are both types of

Match the transport process to its description. -conform(s)to the properties of specificity,competition,and saturation

Match the terms to changes presented,assuming a resting membrane potential of -70 mV.Answers may be used once,more than once,or not at all. -any value other than 0 mV,regardless of relationship to resting potential

You are walking to school one day when you notice an alien spaceship that has crashed in a nearby field.You and some other physiology students collect samples from the beings inside of the spaceship.First,you collect a liquid sample of what appears to be alien blood so that you can test for the concentration of solutes inside the alien blood cells.You then extract some of these cells,place them in various concentrations of glucose in water,then look at them under the microscope.Below is what happens to the cells when they are placed in various concentrations of glucose: Table 5.1 -Refer to Table 5.1.From cells located in another part of the alien's body,you find that the protein-to-lipid ratio of the cell membrane is about 20% protein,78% lipid,and 2% carbohydrate.Assuming the aliens use their cells as Earthlings do,and have the same terrestrial physiology,what is the most likely function of these cells?

Compare and contrast primary active transport and secondary active transport,noting any special differences.

Match the potential or potential change with the causative circumstances.Assume ion movements are net movements.Answers may be used more than once or not at all. -Cl^- enters the cell

There are two solutions separated by a semipermeable membrane.Solution a is 0.2 M NaCl and solution b is 0.1 M CaCl₂.Will there be a net flow of water across the membrane? Why or why not?

Cations will ________ each other.

Which property of diffusion best helps explain the necessity of the circulatory system in multicellular organisms?

Sodium ions are more concentrated in the extracellular fluid than in the intracellular fluid.This is an example of