Exam 5: Membrane Dynamics

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 -50 mV from resting potential

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

Explain why transporting epithelial cells are said to be polarized.What does it mean when a nerve cell is said to be polarized?

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?

The three types of gated channels are ________, ________, and ________.

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: Percent Glucose Condition of Alien Blood Cells 0.02\% cells lyse 0.05\% cells lyse 0.10\% cells lyse 0.12\% cells crenate (shrivel up) 0.20\% cells crenate Table 5.1 -Refer to Table 5.1.How can you determine the osmolarity and tonicity of the alien blood and alien cells?

Pinocytosis and potocytosis are types of

Explain the difference between Fick's law of diffusion and the flux of a molecule.

Explain the purpose of having both the reversible GLUT transporters as well as the SGLT transporters in the body.

Water can cross a cell membrane by a variety of means.List at least three.Do water molecules cross a membrane through the same molecules as other solutes? Explain.Are all cells equally permeable to water? Explain.

Cations will ________ each other.

Match the transport process to its description. -a form of mediated transport

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 +30 mV from resting potential

Briefly explain the difference between open channels and gated channels.

Water is a polar molecule, yet it easily moves through the nonpolar portions of cell membranes.Which transport process is responsible?

Hyposmotic solutions

Distinguish between these statements, explaining what is correct or incorrect about each, and what requires clarification.Relate your answers to the energy hill concept from the previous chapter. A.Passive transport requires energy. B.Active transport requires energy. C.Vesicular transport requires energy.

Explain the differences between channel proteins and carrier proteins and why cells need both.

Compared to the outside surface, the inside of a resting cell membrane is

Red blood cells with an internal osmolarity of 300 mOsM are placed in the following solutions.Designate each solution according to its osmolarity and tonicity, and explain what happens to the cells and why. A.200 mOsM NaCl B.400 mOsM urea C.100 mOsM urea plus 200 mOsM NaCl D.300 mOsM urea E.300 mOsM NaCl F.200 mOsM urea plus 300 mOsM NaCl G.400 mOsM NaCl