blood

Question 1

what are the four components of blood

Answer 1

red blood cells - carry oxygen around your body
white blood cells - fight infections
platelets - work with another substance to form scabs
plasma - carries everything to the correct places

Question 2

functions of red blood cells

Answer 2

no nucleus to make space for haemoglobin

biconcave disc that creates and increased surface area to volume ratio for diffusion

Question 3

functions of white blood cells

Answer 3

bigger than red blood cells
have a nucleus 
2 different types: 
lymphocytes - antibodies and antitoxins 
phagocytes - engulf and digest

Question 4

functions of platelets

Answer 4

very small
they clot and form scabs to stop bleeding
small fragments of cells

Question 5

functions of plasma

Answer 5

transport blood cells, platelets, nutrients and waste products
amino acids and hormones

Question 6

arterys…

Answer 6

thick muscular wall, small lumen

Artery - Away from heart

Question 7

veins…

Answer 7

large lumen

Veins - Visit Valves

Question 8

capillaries…

Answer 8

site of movement in and out, 1 cell thick wall

Question 9

what is the double circulatory system

Answer 9

makes our system very efficient and the deoxygenated blood gets sent to the lungs to become oxygenated and then returns to the heart to be pumped round the body