Biology - Diffusion, Osmosis and Active transport

What is diffusion?

The spreading out of particals from an area of higher concentration to an area of lower concentration

What state of matter does diffusion happen in?

Gas (and Solutions)

What increases the diffusion rate?

A bigger concentration gradient, larger surface area, and a higher temperature

What molecules can dissolve through the cell membrane?

oxygen, glucose, amino acids and water

What bigger molecules cannot fit through the cell membrane?

Starch and proteins

What is osmosis?

The movement of water molecules across a partially permeable membrane from a region of higher water concentration to a region of lower water concentration

What is a partially permeable membrane?

A cell membrane with very small holes in it

What is active transport?

The movement of substances from an area of low concentration to an area of high concentration against a concentration gradient

Why cant root hair cells use diffusion?

The concentration of minerals is higher in the cell than in the soil around them

Where does active transport get its energy from?

respiration

Where does active transport take place in the human body?

taking glucose from the gut and kidney tubules, higher concentration of nutrients in the blood than the gut. ect.

What process do you use if theres a higher concentration of glucose and amino acids in the gut than the blood?

diffusion