Question

diffusion of water through a selectively permeable membrane such as the plasma membrane is specifically called osmosis (oz - mosis). because water is highly polar, it is repelled by the (nonpolar) lipid core of the (1 ) membrane, but it can and does pass easily through special pores called aquaporins (\water pores\) created by proteins in the membrane (figure 3.10b). osmosis into and out of cells is occurring all the time as water moves down its concentration gradient. the movement of water across the (2 ) occurs quickly. anyone administering an iv (intravenous, into the vein) solution must use the correct solution to protect the patients cells from life - threatening dehydration or rupture (see a closer look on p. 79). still another example of diffusion is facilitated diffusion. facilitated (3 ) provides passage for certain needed substances (notably glucose) that are both lipid - insoluble and too large to pass through the membrane pores, or charged, as in the case of chloride ions passing through a membrane protein channel. although (4 ) diffusion follows the laws of diffusion - that is, the substances move down their own concentration gradients - a protein membrane protein channel is used (figure 3.10c), or a membrane protein that acts as a carrier (figure 3.10d) is needed to move glucose and certain other (5 ) passively across the membrane into the cell. 1 diffusion 2 facilitated 3 solutes 4 plasma 5 membrane 1 facilitated 2 solutes 3 plasma 4 membrane 5 diffusion 1 plasma 2 membrane 3 diffusion 4 facilitated 5 solutes 1 membrane 2 diffusion 3 facilitated 4 solutes 5 plasma 1 solutes 2 plasma 3 membrane 4 diffusion 5 facilitated

Explanation:

Water is repelled by the non - polar lipid core of the plasma membrane but passes through aquaporins. Osmosis is water movement across the membrane. Facilitated diffusion uses membrane proteins (channels or carriers) to move substances like glucose and certain solutes down their concentration gradients.

Answer:

1 plasma, 2 membrane, 3 diffusion, 4 facilitated, 5 solutes