Blood Learning objectives: Describe the composition of the blood Explain how adaptations of red blood cells make them suitable for their function Understand the role of plasma Ask for own definition. NOTES.

RECAP The main function of the circulatory system is transport. It is particularly important for the delivery of reactants of respiration, and disposing of the waste products of respiration The circulatory system consists of: Heart (pump) Blood vessels (arteries, veins and capillaries extend throughout the body) Blood (transport medium)

Blood: function Blood is a transport medium Task 1: What is transported by blood?

What is transported by blood? Nutrients (e.g. glucose, amino acids) Antibodies (protein molecules involved in immunity) Carbon dioxide (waste product of aerobic respiration) Hormones (transported from gland to target cells) Oxygen (reactant for aerobic respiration) Urea (nitrogenous waste filtered out of the blood by kidneys) Heat (skin arterioles can change diameter in order to gain or lose heat)

Blood: components Plasma – liquid portion of the blood Erythrocytes – (red blood cells) – carry oxygen (and some carbon dioxide) Leucocytes – (white blood cells) – protect the body against infection – phagocytes and lymphocytes Platelets – cell fragments assist in clotting

Blood: components Task 2 In your groups, you will be assigned a blood component You must… Prepare a 2 minute presentation to inform your classmates about your component Plasma Red blood cell Lymphocyte (white blood cell) Phagocyte (white blood cell) Platelets plasma

Blood: components (20Qs) Which has a nucleus? Which is the liquid part of the blood? Which carries nutrients such as glucose? Which carries oxygen? Which cell does not have a nucleus? Which contains haemoglobin? Which is not a proper cell, just a fragment? Which digests microbes? Which makes antibodies? Which has a biconcave disc shape? Which increases in number if we get an infection? Which carries hormones? Which is shaped to have a large surface area? Which carries carbon dioxide? Which helps the blood to clot and make a scab? Which is a straw coloured liquid? Which is mis-shaped in sickle cell anaemia? Which has two types? Also known as red blood cells? Also known as white blood cells?

Blood: components (20Qs) 1. Which has a nucleus? leucocytes 2. Which is the liquid part of the blood? Plasma 3. Which carries nutrients such as glucose? Plasma 4. Which carries oxygen? erythrocytes 5. Which cell does not have a nucleus? erythrocytes 6. Which contains haemoglobin? erythrocytes 7. Which is not a proper cell, just a fragment? Platelet 8. Which digests microbes? phagocytes 9. Which makes antibodies? lymphocytes 10. Which has a biconcave disc shape? erythrocytes 11. Which increases in number if we get an infection? lymphocytes 12. Which carries hormones? Plasma 13. Which is shaped to have a large surface area? erythrocytes 14. Which carries carbon dioxide? Plasma 15. Which helps the blood to clot and make a scab? Platelets 16. Which is a straw coloured liquid? Plasma 17. Which is mis-shaped in sickle cell anaemia? erythrocytes 18. Which has two types? Leucocytes 19. Also known as red blood cells? Erythrocytes 20. Also known as white blood cells? leucocytes

Thumbs up or down Learning objectives: Describe the composition of the blood Explain how adaptations of red blood cells make them suitable for their function Understand the role of plasma