MediHealth

  • Obstructive Sleep Apnoea (OSA)
    Updated: Nov 26, 2009 - 17:35

    If you have OSA, the muscles in your throat relax and block your airways while you are asleep. This stops you from breathing for a short time. ‘Obstructive’ means something is blocking your airways, and ‘apnoea’ means ‘not enough oxygen’. So OSA means there is something blocking your breathing wh...

  • Occipital lobe
    Updated: Nov 17, 2009 - 13:26

    Your occipital lobe is at the back of your brain. It tells you what your eyes are looking at. ...

  • Oesophagus
    Updated: Nov 17, 2009 - 13:26

    Your oesophagus carries food to your stomach after you have swallowed it. Smooth muscles work together in rhythm to push your food downwards. Did you know? The length of your oesophagus is about 25 centimetres. ...

  • Oestrogen modulator
    Updated: Nov 17, 2009 - 13:26

    Oestrogen modulators interfere with how a hormone called oestrogen works. Some hormones are different in men and women - the hormone for femaleness is oestrogen, and the hormone for maleness is testosterone. Mammary gland (breast) cells are activated to grow by oestrogen, so oestrogen modulators ...

  • Oligodendrocytes
    Updated: Dec 15, 2009 - 16:57

    Oligodendrocytes are a type of cell found in your brain and spinal cord. Neurons, the main cells in your brain, send messages to other cells from their body down a long tail called the axon. Oligodendrocytes wrap around the axons so they are protected by a special sheet made of a fat, protein...

  • Ophthalmologist
    Updated: Nov 17, 2009 - 13:26

    Ophthalmologists are specialist doctors who are eye experts, and they are usually based in hospitals. They can examine your eyes to make sure they are healthy, and can diagnose and treat eye diseases and injuries, with medicines or surgery. ...

  • Ophthalmology
    Updated: Nov 17, 2009 - 13:26

    Opthalmology is the study of your eyes and diseases that affect them. The doctors who specialise in ophthalmology are called ophthalmologist. ...

  • Optic nerve
    Updated: Nov 17, 2009 - 13:26

    Your optic nerve sends information about what you see from your retina to your brain. ...

  • Optician
    Updated: Nov 17, 2009 - 13:26

    An optician is someone who provides you with glasses or contact lenses to correct a refractive error. Opticians work in a variety of different places, including hospitals, special eye care centres and even shops! ...

  • Oral thrush
    Updated: Dec 22, 2009 - 11:46

    Oral thrush, also called candidiasis, is an infection you get in your mouth. For more information, have a look at the NHS Choices article on oral thrush. ...

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