Year 8- Blood and blood vessels.

The _______ carries nutrients, carbon dioxide and waste products.

• Plasma

• Red blood cells

• White blood cells

• Platelets.

The _____________ carry oxygen.

• Plasma

• Red blood cells

• White blood cells

• Platelets.

The _______________ defend out bodies against pathogens.

• Plasma

• Red blood cells

• White blood cells

• Platelets.

_____________ are involved in blood clotting.

• Plasma

• Red blood cells

• White blood cells

• Platelets.

_______ carry blood away from the heart

• Arteries

• Veins

• Alveoli

• Bronchioles

Arteries have _______ walls to withstand high pressure

• Thick

• Thin

• Long

• Short

Arteries have ______ walls so they can stretch and return to their original shape.

• Elastic

• Inelastic

• Tough

• Thick

Arteries have thick muscle so they can maintain ______ on the blood

• Pressure

• Shape

• Structure

• Heat

Veins carry blood _______ the heart

• Towards

• Away from

• Up too

• Down from

Veins have valves to prevent the ________ of blood.

• Backflow

• movement

• leaking

• flow