unit2: lesson 7( osmorereulation + tonicity)

osmoreregulation

Controlling the balance of water and salt inside a living thing

What is an essential aspect to cells?

Cells need to balance how much water they absorb and lose to their external environment

What is constantly moving across membranes?

Water and other molecules

The diffusion of water

Osmosis

Water moves from…

High water potential to low water potential

What occurs when osmosis happens

Water will typically diffuse to where there is more solute(dissolved solids) from low solute to high solids. Water can passively move across membranes, but solutes can’t.

Water follows what ?

The solutes

Hypertonic

Solution that has more solute like sugar or salt and less water in the cell.

What happens when a cell is placed in hypertonic solution

Water moves out of the cell to balance things out, causing the cell to shrink and shrivel

Hypotonic

A solution has less solute like sugar or water and more water in the cell

Lyse

Cells without a cell wall

How do plant cells react in a hypotonic condition?

Their vacuoles remain turgid, because of their central vacuole, meaning can take more water that will apply more pressure on the inside of the cell walls.

What will happen if animal cells go through hypotonic environment

They will go through lyses because they do not contain the central vacuole

what happens when a cell is placed in a hypotonic solution

The water moves into the cell, causing the cell is swell and possibly burst

Isotonic

when the solution has the same amount of water and solute in the cell

What happens when a cell is in an isotonic solution

Water moves in and out equally so the cell stays the same size it does not shrink or swell

Water moves…

From high water potential to lower water potential