Diffusion, Osmosis, Active Transport

Villi increase exchange of nutrients by..

(select 3 answers)

• possessing microvilli, increasing surface area

• maintaining an equal concentration gradient to reduce flow

• possessing thick surfaces to increase transport

• possessing thin surfaces to increase transport

• maintaining a high concentration gradient

Select two options.

Exchange surfaces are thin as this

• reduces the time the substance spends as a solute

• reduces the distance a substance has to travel

• increases efficiency

• decreases efficiency

Osmosis is the movement of ________ across a semi-permeable membrane.

• food

• energy (ATP)

• oxygen

• water

A cell moves particles using energy against the concentration gradient by

• active transport

• passive transport

• diffusion

• osmosis

What is the definition of  Selective Permeability?

• The movement of materials across the cell membrane that requires NO ENERGY from the cell.
  
• The movement of materials through (or across) the cell membrane
  
• The ability of the cell membrane to allow some things to pass through while preventing other things from passing through.
• The movement of molecules from an area of high concentration to a area of low concentration 
  

Osmosis

• diffusion of water molecules through a semi-permeable mebrane from an area of low concentration to an area of high concentration
• the diffusion of particles from an area of high concentration to an area of low concentration
• diffusion of water molecules through a semi-permeable membrane from an area of high concentration to an area of low concentration
• the diffusion of particles from an area of low concentration to an area of high concentration

What does this diagram BEST represent?

• Diffusion

• Active Transport

• Osmosis

The picture below is an example of _________________.

• osmosis
• isotonic
• diffusion
• active transport

_______ regulates what enters and leaves a cell.  

• Cell Membrane
• Nucleus
• Mitochondria
• Cytoplasm

Active Transport uses energy in the form of-

• Glucose

• ATP

• Sodium

• DNA