diffusion + diffusion in living things

Question 1

what happens during gas exchange in the lungs?

Answer 1

oxygen enters the lungs and diffuses into the alveoli, carbon
dioxide diffuses out of the alveoli and exits the lungs

Question 2

desribe the movement of particles in a solid

Answer 2

tightly packed together, holding to a structure

Question 3

describe the movement of particles in a liquid

Answer 3

they move loosley and are able to move past each other, but still in a structure

Question 4

describe the movement of particles in a gas

Answer 4

they can move freely

Question 5

what is diffusion?

Answer 5

the spreading out of particles, of liquid or gas, resulting in net movement from an area of high concentration to low concentration

Question 6

can diffusion occur through a selectively permeable membrane? give an example

Answer 6

yes, like a cell membrane

Question 7

how can we speed up the rate of diffusion?

Answer 7

an increase in temperature, an increase in concentration gradient or an increase in surface area

Question 8

what is the equation for ratio?

Answer 8

ratio = surafce area / volume