1. CB2 Topic 8 Exchange and Transport - Animals.
Draw a table to show one way in which each type of blood vessel is adapted for its function?
Explain why blood in the vena cava is dark red but the blood in the aorta is bright red?
Explain how oxygen is transported from the lungs to tissue?

2. CB2 Topic 8 Exchange and Transport - Animals.
Efficient transport and exchange:
Label the correct parts.
Draw a table to show one way in which each type of blood vessel is adapted for its function?
Arteries – Thick wall to withstand pressure/Elastic muscular wall to squeeze back on the blood and even out the flow
Veins – Valves to stop blood flowing the wrong way/thin walls allow skeletal muscles to squeeze the veins and push blood along
Capillaries – thin wall to allow fast diffusion
Explain why blood in the vena cava is dark red but the blood in the aorta is bright red?
Haemoglobin is brighter red when carrying more oxygen
Blood in the aorta has just been oxygenated
Blood in the veins (vena cava) has returned from the capillaries in the tissue, which have removed the oxygen
Explain how oxygen is transported from the lungs to tissue?
Oxygen is carried by red blood cells
Oxygen diffuses in/out of cells along its concentration gradient
Oxygen binds to haemoglobin
Blood is pumped by the heart.