Transport systems

Question 1

Blood

Answer 1

• transports substance around the body
• through a large network blood vessels
• adults = 5-6 litres of blood
• children = 75 millilitres (mL) of blood per kilogram of body weight.
• fluid = plasma
• blood cells

Question 2

Plasma

Answer 2

• 90% water
• dissolved substance = nutrient absorbed from the alimentary canal, o2 absorbed from lungs
• waste materials from blood eliminated by excretion

Question 3

Blood cells

Answer 3

• Erythrocytes (red blood cells) = transport o2 & carbon dioxide from lung to body cells
• Leukocytes (white blood cells) = defence against infection & foreign substances
• Platelets (thrombocytes) cell fragments = essential in blood clotting