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B2 Keeping Healthy

B2 Keeping Healthy. Revision. B2. yum. 1 st. B2. Body defence. Body defence. yum. 2 nd. antibodies. Risk. Immunity. B2 Keeping Healthy. Heart disease: risk. First line of defence Eyes : tears antiseptic Ears : wax is antibacterial Stomach : contains acid Skin : sweat glands.

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B2 Keeping Healthy

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  1. B2 Keeping Healthy Revision

  2. B2 yum

  3. 1st B2 Body defence Body defence yum 2nd antibodies Risk Immunity

  4. B2 Keeping Healthy Heart disease: risk First line of defence Eyes: tears antiseptic Ears: wax is antibacterial Stomach: contains acid Skin: sweat glands Smoking • Pathogens • viruses • bacteria • fungi Obesity Excess alcohol Unhealthy diet Antibiotics: don’t work on viruses Placebo: no active chemicals Blind trial: patient doesn't know if drug is a placebo Phagocytes “eat” pathogens Second line of defence White blood cells Drugs Clinical trials: consider ethics antibodies clump to pathogens immobilising them Reduce Risk Double Blind trial: patient or doctor doesn't know if drug is a placebo The body takes time to make new antibodies; so you get sick Vaccines force the white blood cells to make antibodies, when you meet the real pathogen you don’t get sick When you recover you have memory cells Risk with all medication Immunity

  5. Describe what's happening in the picture

  6. Describe what’s happening in the picture Give as much detail as possible Antibodies are produced. They are very specific to one type of pathogen Vaccine containing weakened or dead pathogens induce an immune response Sometimes there are side effects Memory cells are produced so when you come in contact with the real pathogen they produce antibodies quickly so you don’t get sick; this is immunity.

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