OCR 21st century science B7.2
- Created by: isis
- Created on: 16-06-13 15:18
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- Circulation
- Blood
- Components of blood
- Plasma
- The pale yellow liquid that cells float in, mainly water
- Transports nutrients, (oxygen and glucose)antibodies, hormones and waste (carbon dioxide and urea)
- Red blood cells
- Transports oxygen
- Packed full of haemoglobinto bind oxygen
- No nucleus to increase space for haemoglobin
- Biconcave shape to increase surface area for oxygen exchange and gives flexibility so can squeeze through tiny capillaries.
- Platelets
- Fragments of cells that are made from the cytoplasm of large cells.
- Help with blood clotting.
- White blood cells
- Fights infection.
- Produce anti bodies, and engulf and digest microorganisms by phagocytosis
- Plasma
- Components of blood
- Double circulation
- Heart
- Valves
- Between atria and ventricles.
- Stop the backflow of blood
- Between atria and ventricles.
- Between ventricles and arteries.
- Between ventricles and arteries.
- Atria
- Blood from body enters right atrium
- Blood from lungs enters left atrium.
- Ventricles
- Blood to lungs leaves right ventricle.
- Blood to body leaves left ventricle.
- Blood vessels
- Blood from body entering heart through the vena cava.
- Blood entering lungs from heart through the pulmonary artery
- Blood from lungs entering heart through pulmonary vein
- Blood entering body from heart through aorta.
- Valves
- Capillaries
- Tiny blood vessels that are one cell thick and porous which makes them ideal for diffusion.
- They carry blood through the tissues between the arteries and veins.
- Tissue fluid
- Contains all dissolved raw materials being carried by blood plasma.
- As blood passes through pressure drops. Plasma stops being squeezed out , tissue fluid moves back into capillaries.
- At high pressure plasma is squeezed out. Forms tissue fluid, which bathes all cells.
- Heart
- Blood
- White blood cells
- Fights infection.
- Produce anti bodies, and engulf and digest microorganisms by phagocytosis
- Tiny blood vessels that are one cell thick and porous which makes them ideal for diffusion.
- At high pressure plasma is squeezed out. Forms tissue fluid, which bathes all cells.
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