Unit 4 Homeostasis [Biology]

Front

What is an isotonic solution?

Back

An isotonic solution is a solution that has the same concentration of solutes as another solution, resulting in no net movement of water across a selectively permeable membrane.

Front

What is osmosis?

Back

Osmosis is the movement of water through a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

What is homeostasis?

Back

Homeostasis is the process by which living organisms maintain stable internal conditions despite changes in the external environment.

Front

How does the body respond to excess water intake?

Back

When you drink too much water, the kidneys respond by absorbing less water, helping to maintain a stable water level in the body.

Front

What are phosphate heads in a phospholipid bilayer?

Back

Phosphate heads are the hydrophilic (water-attracting) part of phospholipids that make up the cell membrane, facing outward towards the water inside and outside the cell.

Front

What is the role of the kidneys in homeostasis?

Back

The kidneys help maintain homeostasis by regulating the balance of water, electrolytes, and waste products in the body.

Front

What is diffusion?

Back

Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration until equilibrium is reached.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the process by which molecules pass through the cell membrane with the help of transport proteins, moving from high to low concentration.

Front

What is active transport?

Back

Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, requiring energy.

Front

What happens to cells in a hypertonic solution?

Back

In a hypertonic solution, cells lose water and may shrink because the concentration of solutes outside the cell is higher than inside.