2.3a - Adaptations for transport in animals

Question 1

what are some typical features of transport mediums?

Answer 1

• suitable medium in which to carry materials eg blood
• a pump to move materials eg heart
• a system of vessels with branching networks to distribute the transpprt medium all over the body

Question 2

how do cells get blood in open circulatory systems?

Answer 2

blood doesn’t move around the body in vessels, instead the cells are bathed by blood

Question 3

where in open circulatory systems is blood held?

Answer 3

in the internal body cavity - the haemocoel

Question 4

define the haemocoel

Answer 4

main body cavity found in most invertebrates that contains a circulatory fluid

Question 5

give an example of an organism which have an open circulatory system (what is their heart like?)

Answer 5

insects, they have long, dorsal tube shaped-hearts

Question 6

why don’t insects need respiratory pigments?

Answer 6

bc oxygen is supplied directly to tissues via the tracheal system

Question 7

why are open circulatory systems relatively inefficient?

Answer 7

bc they’re not responsible for the distribution of respiratory gases in insects

Question 8

what are the two types of closed circulatory systems?

Answer 8

single and double