transport

Question 1

Define and differentiate between passive and active mechanisms of transport.

Answer 1

Passive transport: requires no energy and happens naturally, moves along membrane Active transport: requires energy and uses ATP, moves against concentration (low to high)

Question 2

Describe what drives the direction of simple diffusion.

Answer 2

The rate of diffusion drives the direction of simple diffusion – always go from high to low gradients of
concentration

Question 3

What factors influence the rate of diffusion?

Answer 3

Permeability: liquid or solid soluble
Concentration: molecules naturally move from high to low
Molecule size: the smaller the molecule the quicker the rate of diffusion

Question 4

How does active transport differ from passive? What are the 2 types of active transport?

Answer 4

Active uses energy and passive does not use energy
Primary Active Transport and secondary active transport

Question 5

Define endocytosis and exocytosis. Know examples of each type of transport in human physiology.

Answer 5

Exocytosis: moves large molecules out of the cell (mucus being released from cells when you have a cold and pancreas releasing insulin)
Endocytosis: moves large molecules into the cell, 2 different types of endo (cell eating-WBC defending
against disease by taking in bacteria)