Unit 1 Movement of Substances – Diffusion-S/A to Volume Ratio

Diffusion & Facilitated Diffusion are both (a)   transport.

• Passive
• Active
• Easy
• Free

Passive Transport is the movement of particles across the membrane from an area of [ ___ ] to an area of [ ___ ]

• high to low

• low to high

• low to low

• high to high

Passive Transport uses ____ energy

• no

• a lot of

• a little bit of

• some

_____________ is the free movement of particles across the membrane with the concentration gradient

• diffusion

• facilitated diffusion

• active transport

• fusion

Passive Transport is the movement of particles _________ the concentration gradient.

• with

• against

• opposing

• throughout

An example of diffusion is

• CO₂ and O₂ exchange in the lungs

• Glucose transport

• Na⁺ / K⁺ Pumps

• Exocytosis

The general name for movement of substances across cell membranes without need of energy input

• passive transport

• active transport

The condition in which all acting influences are balanced.

• equilibrium

• dynamic equilibrium

• net movement

Small changes of particles moving across the membrane that sum together to produce no net change.

• equilibrium

• dynamic equilibrium

• net movement

The number of molecules moving one direction minus the number of molecules moving in the other direction.

• equilibrium

• dynamic equilibrium

• net movement