Exam 5: Membrane Dynamics

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

Which of the following would increase the rate of diffusion across a cell membrane?

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

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

Explain and distinguish between the following: A.chemical reaction equilibrium B.chemical equilibrium C.osmotic equilibrium

The inside of a resting cell is slightly negative relative to the outside.This is an example of

Explain the steps that occur in a pancreatic beta cell so that insulin is secreted.

How does the beta cell in the pancreas react to release insulin when glucose levels are low?

Provide the basic physics definition of the term fluid.What is bulk flow relative to body compartments? What types of matter move by bulk flow? What is fundamentally different in the behavior of these types of matter?

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

Bulk flow is fluid flow as a result of a(n)________ gradient.

Which of the following statements about the resting membrane potential is True?

Which of the following is a unique characteristic of glucose as a solute in biological systems?

Nurse Cameron has been asked to mix an isotonic intravenous solution for an emergency room patient who has lost a lot of blood.The available solutes include glucose (m.w.180), NaCl (m.w.58.5), and urea (m.w.60).How should she make up 10 L of IV solution with an osmolarity of 290 mOsm (isosmotic), making sure that it will also be isotonic?

Anions will ________ each other.

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.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?

In an epithelium, the apical membrane is also known as the ________ membrane.

Match the membrane protein with its function. -structural proteins

Diuretics cause the kidneys to produce large amounts of urine.Unfortunately, they can also cause the loss of large quantities of K⁺ in the urine.What effect might prolonged use of diuretics have on nerve or muscle cells?

Match the type of transport with its description. -from an organ's lumen to the extracellular fluid