The heart (arteries, veins, red blood cells, platelets)

Question 1

Plasma

Answer 1

transports dissolved chemicals and proteins around the body

Question 2

platelets

Answer 2

help blood to clot at the site of a wound

Question 3

whats the arterys role

Answer 3

to carry high pressure blood away from the heart

Question 3

the veins role

Answer 3

carrys lower pressure blood towards the heart

Question 4

the capillarys job

Answer 4

they are involved in the exchange of substances with cells and tissues

Question 5

properties of Artery

Answer 5

• strong elastic walls
• the walls are thick compared to the lumen (the size of the hole in the middle)
• contain thick layers of muscle to make them strong, elastic fibres allow them to stretch and spring back

Question 6

properties of capillaries

Answer 6

• really tiny
• really narrow, can squeeze into gaps between cells (means they can carry blood really close to every cell in body to exchange substances with them
  -permemable walls, so substances can diffuse in and out
  -supplies food and oxygen, takes away waste like Carbon dioxide
• walls are one cell thick, increases rate of diffusion by decreasing the distance over which it occurs