FEATURES OF A TRANSPORT SYSTEM

Question 1

transport systems in animals need… (3)

Answer 1

• a medium to carry materials
• a pump (e.g heart) for moving blood
• valves to maintain flow in one direction

Question 2

some systems also have… (2)

Answer 2

• a respiratory pigment (increases volume of o2 carried)

- a network of branches to transport blood to all the tissues

Question 3

open circulatory systems

Answer 3

• tissues bathed directly when blood is held in the haemocoel

Question 4

describe an insects circulatory system? (4)

Answer 4

• open circulatory system
• long dorsal tube shaped heart running length of body
• pumps out blood at low pressure into haemocoel
• blood returns slowly to the heart and starts again

Question 5

closed circulatory system

Answer 5

• blood moves in blood vessels

Question 6

types of closed circulatory system (2)

Answer 6

• double

- single

Question 7

single circulatory system

Answer 7

• blood moves around the heart once when it goes around the body

Question 8

earthworm circulatory system (2)

Answer 8

• blood moves in dorsal vessel and back in ventral vessel

- five pairs of pseudohearts (thick, muscular blood vessels) pump blood from dorsal to ventral and keep it moving

Question 9

fish circulatory system (2)

Answer 9

• ventricle pumps deoxygenated blood to gills where pressure falls
• oxygenated blood carried to tissues and deoxygenated blood returns to the heart

Question 10

double circulatory system (7)

Answer 10

• passes through heart twice in circuit around the body
• blood is pumped by heart at high pressure
• rapid flow through blood vessels
• organs not in direct contact with blood but bathed in tissue fluid which seeps from capillaries
• blood pigment, haemoglobin, carries o2
• pressure reduced in lungs bc fragile but too low for body
• so blood returns to heart and pressure rises