cardiovascular system - in vertebrates

Question 1

circulation is where…

Answer 1

substances move within a cell and between parts of an organism

Question 2

what does a circulatory system consist of ?

Answer 2

-fluid
-tubes
-force

Question 3

fluid

Answer 3

for transporting materials

Question 4

tubes

Answer 4

where fluid flows

Question 5

force

Answer 5

which drives the fluid

Question 6

protozoans (amoeaba/paramecium)

Answer 6

-members of protista kingdom (unicellular)
-have NO circulatory system
-accomplish transport by DIFFUSION or ACTIVE TRANSPORT

Question 7

hydra

Answer 7

-these coelenterates (multicellular) are only 2 cell layers thick
-accomplish transport by DIFFUSION or ACTIVE TRANSPORT

Question 8

why have circulation ?

Answer 8

-small organisms don’t have circulation
-larger organisms need circulation because of the limits of diffusion

Question 9

diffusion

Answer 9

t = x^2/2D
-t = time for diffusion
-x = distance for diffusion
-D = diffusion coefficient

Question 10

functions of circulation

Answer 10

maintain optimal environment for cells
-delivery of nutrients, removal of waste
-maintenance of pH
-maintenance of osmotic pressure
-heat

Question 11

functions of circulation

Answer 11

transport of hormones
-communication

Question 12

circulation and diffusion

Answer 12

circulation: transports nutrients etc. to within 10-20µm of the cell
diffusion: takes them to cell surface