Lab 5 Quiz

Actively gain salt through gills, as too much water flows in, water is excreted as very dilute urine

Discuss the challenge related to osmoregulation that organism have to face in a fresh water environment

Lose water through the gills, but compensate by drinking lots of water and actively remove the salt in concentrated urine

Discuss the challenge related to osmoregulation that organism have to face in a salt water environment

The cells divide when they get too big

How does your body adapt to area to volume ratios to help exchange gases?

When a cell grows, its volume increases at a greater rate than its surface area. Its SA:V ratio decreases

If a large surface area is helpful to cells, why do cells not grow to be very large?

the small cube

In terms of maximizing diffusion, what was the most effective size cube that you tested?

An advantage of large organisms being multi-cellular is that they have many different kinds of cells; and have separate organ systems to assist in transporting materials

What are the advantages of large organisms being multicellular?

The bacteria needs efficient diffusion in order to sustain itself. If the bacteria grew larger, than its surface area to volume ratio would be reduced; making diffusion less efficient, and cause death to the bacteria.

Why cant certain cells like bacteria, get to be the size of a small fish?

The small size was easier to diffuse through because a smaller cube has a bigger surface area to volume ratio. The size of cells or tissues affect the surface area to volume ratio

Why was that size most effective at maximizing diffusion? What are the important factors that affect how materials diffuse into cells or tissues?

5:2 would be most effective, because it is the bigger ratio. This means it has a larger surface area to volume

You have three cubes A,B, and C, They have surface to volume ratios of 3:1, 5:2, and 4:1 respectively. Which of these cubes is going to be the most effective at maximizing diffusion, how do you know this ?