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BIOLOGY (B5 (Eye (diagram of the eye labeled (dropped image link), cornea…

- - - - chloroplast absorbs sunlight and uses water and carbon dioxide to do photosynthesis
    - - The high concentration of oxegon and carbon dioxide diffuses into the plant through the leaf.
    - - Photosynthesis is endothermic because the plant absorbs the heat from the sun to break up the oxegon
    - - temperature impacts photosynthesis by the hotter it is the more photosynthesis happens because it can give the plant energy. However , if it is too hot the plant will wither because the H20 will evaporate out of the plant. Light intensity will affect the rate of photosynthesis because the more light the quicker the rate that the H20 breaks down. Finally the more CO2 the quicker the rate of photosynthesis because the CO2 is used to convert into energy.
    - - Starch tests show the amount of starch using iodine. The more starch there is the more glucose being produced
      - The lamp practical shows the further away light is the less the rate of photosynthesis is.
- - - - vein
      - artery
        
        Arteries carry blood from the heart to the lungs and the rest of the body. The thick muscular wall can withstand the high pressure of blood as it leaves the heart. They branch to become cappillaries. Capillaries take blood to and from every cell . The one cell thick wall allows oxegon to go through and oxegenate the blood quickly and easily.Capillaries then join together to become veins. The veins then carry blood back to the heart. The thin layer of muscle allow them to be squashed and to push the blood upwards. Valves in the veins then stop the blood going back again.
      - capillaries
    - - Red blood cells
        
        There are a lot of these and are known to be red however it is the haemoglobin that gives them this colour . oxegon is added in the lungs then oxegon is realeased in the tissue
      - white blood cells
        
        Found throughout the body, including the blood and lymphatic system. unlike other blood cells they have nuclei. They are used in defending the body from diseases by sending out antibodies to attach to the antigen. After this another white blood cell will come and ENGULF that antibody. They can then after they have killed the antibodies go. However some turn into MEMORY CELLS and then if that same antibody returns they can kill it rapidly. An example of this is chicken pox... after the first time they won't affect the body again because of the memory cells.
      - platelets
        
        a small colourless disc shaped cell fragment without a nucleus, found in large numbers in blood and involved in clotting.Platelets are tiny blood cells that help your body form clots to stop bleeding. If one of your blood vessels gets damaged, it sends out signals that are picked up by platelets. The platelets then rush to the site of damage and form a clot to repair the damage.The process of spreading across the surface of a damaged blood vessel to stop bleeding is called adhesion. This is because when platelets get to the site of the injury, they grow sticky tentacles that help them adhere. They also send out chemical signals to attract more platelets to pile onto the clot in a process called aggregation.
      - haemoglobin
        
        haemoglobin bonds with oxegon to make oxyhaemoglobin as it passes through the lungs. oxegon is then realeased into tissue.
      - plasma
        
        contains water, salts, enzymes, antibodies and other proteins. 90% water. it can transport carbon dioxide, digested food, urea, hormones and heat
    - - The heart pumps some blood to the lungs and some blood to the rest of the body each time it beats. The blood on the left side is kept separate from the blood on the right side. This is called double circulation and is efficient way of delivering oxygen to the tissues than single circulation.Blood enters the heart through a vein and collects in an atrium. The atrium is emptied into a ventricle which contracts to put the blood under pressure. The blood is forced out through an artery as a valve prevents it flowing back to the atrium. The artery also contains a valve to stop blood flowing back to the ventricle when the ventricle relaxes.
  - - - Front part of the tough outer coat, the sclera. It is convex and transparent.
        
        refracts light - bends it as it enters the eye
    - - Pigmented - decides the colour of your eyes - so light cannot pass through. Its muscles contract and relax to alter the size of its central hole or pupil.
        
        controls how much light enters the pupil
    - - Transparent, bi-convex, flexible disc behind the iris attached by the suspensory ligaments to the ciliary muscles.
        
        focuses light onto the retina
    - - The lining of the back of eye containing two types of photoreceptor cells - rods - sensitive to dim light and black and white, cones - sensitive to colour. A small area called the fovea in the middle of the retina has many more cones than rods.
        
        contains the light receptors
    - - Bundle of sensory neurones at back of eye.
        
        carries impulses from the eye to the brain