blood and the heart

Question 1

how is blood composed

Answer 1

red blood cells, white blood cells, platelets, plasma

Question 2

role of plasma

Answer 2

transport carbon dioxide, urea, hormones and heat energy

Question 3

how is a red blood cell adapted

Answer 3

biconcave shape, no nucleus, presence of haemoglobin

Question 4

how does adrenaline affect the heart

Answer 4

increases heart rate

Question 5

structure of arteries

Answer 5

thick muscle walls, small lumen

Question 6

structure of veins

Answer 6

thick elastic walls, wide lumen, valves

Question 7

structure of capillary

Answer 7

one cell thick wall