Anatomy 1 : HW 3 - Cell

Which of the following is the main component of the cell membrane? phospholipids cholesterol carbohydrates water

Which of the following is a characteristic of the cell membrane? impermeable fully permeable semipermeable not permeable

Which of the following is not a major function of proteins in the cell membrane? acting as receptors anchoring cells to other structures forming the entire glycocalyx forming channels

What part of a cell membrane is usually in contact with the interstitial fluid? phosphate heads of phospholipids fatty acid tails hydrophobic molecules cholesterol

Which of the following best explains diffusion? exchange of nonpolar molecules for polar molecules movement of molecules from where there are fewer of them to where there are more movement of molecules farther away from equilibrium movement of molecules from an area of high concentration to an area of low concentration

Which of the following is most likely to move through the cell membrane by facilitated diffusion? CO2 small lipids Na+ O2

What is the basic difference between simple diffusion and facilitated diffusion across a cell membrane? In facilitated diffusion, molecules only move with the aid of a protein in the membrane. In simple diffusion, molecules move down the concentration gradient but in facilitated diffusion molecules move up the concentration gradient. Simple diffusion is passive but facilitated diffusion is an active process that uses energy. Simple diffusion requires molecules to move through special doorways in the cell membrane.

Which of the following is least likely to increase the rate of diffusion?

Which of the following is not required for osmosis to occur? water selectively permeable membrane concentration gradient cellular energy

Which of the following solutions contains the most solute? isotonic hypertonic * hypotonic equilibrium

In general, to maintain homeostasis the relationship between our intracellular and extracellular fluids should be which of the following? intracellular and extracellular should both be hypertonic isotonic to each other * intracellular should be hypotonic to extracellular intracellular should be hypertonic to extracellular

If a person is severely dehydrated, their extracellular fluids will become hypertonic to the intracellular fluid. What do you predict will happen to the person's cells? Hints The cells will swell. The cells will rupture. Extracellular fluids do not impact cell size, because cells contain intracellular fluid. The cells will lose water and shrink. *

Which of the following is characteristic of cilia? They are whiplike, motile cellular extensions that occur in large numbers on the exposed surfaces of certain cells. * They move substances in many directions across a cell's surfaces. They are substantially longer than flagella, and are less common than flagella in humans. They are used for cellular adhesion.

What is a membrane potential? the possibility of cell activity the ability of the cells to perform their specialized functions cooperation between cells * a voltage or electrical charge across the plasma membrane

Drinking alcohol makes the blood hypertonic. Which option best describes the consequences of this hypertonic blood? Hypertonic blood forces water into the interstitial fluid, which makes the interstitial fluid hypotonic. This, in turn, makes the interstitial fluid lose water to the cells. * Hypertonic blood draws water out of the interstitial fluid, which makes the interstitial fluid hypertonic. This, in turn, draws water out of the cells. Hypertonic blood draws water out of the interstitial fluid, which makes the interstitial fluid hypotonic. This, in turn, makes the interstitial fluid lose water to the cells. Hypertonic blood will lose water to the interstitial fluid, which makes the interstitial fluid hypertonic. This, in turn, causes water to move into the cell.