biology

• tissue


  a group of the same cells with the same function
• muscular tissue


  contract to bring movement
• epithelial


  covers surfaces
• glandular tissue


  secretes enzymes and hormones
• Digestive system


  labels

  
• salivary glands 


  produce amalyse enzyme
• stomach


  produce stomach acid and protease enzyme
• pancreas


  produces enzymes
• large intestine


  absorbs excess water
• gall bladder


  stores biles to release into small intestine
• liver


  store bile to help us digest fats and neutralise stomach acids
• small intestines


  break down food and absorb nutrients needed for the body
• Red blood cells

  carry oxygen from our lungs to the rest of our body
• what are the adaptations of RBC

  no nucleus-more space for haemoglobin and oxygen, shaped as bi concave disc so large surface area
• white blood cell

  engulf + destroy pathogen
• platelets-small fragments of cell

  help blood clot at a wound
• plasma


  makes blood watery so it can flow
• arteries


  carry blood away from heart, thick walls
• capillaries

  exchange substances with cells, single cell thick + permeable
• veins


  transport blood back to the heart, thin walls, has valves which prevent blood flowing backwards
• what is coronary heart disease?

  build up off fatty acids in coronary artery which narrows and reduces blood flow - less O2 + glucose so less respiration which= heart attack
• stents

  a tube inserted in the artery to keep it open to let blood flow pros- fast recovery time + keep artery open cons-blood clots form + infection
• Statins

  drug that reduces bad cholesterol pros-reduce risk of stroke + increase good cholesterol cons-long term drug + side effects
• artificial heart

  a pump that is placed in the chest to replace damaged heart ventricles and valves. pros-allows heart to rest until a donor cons-surgery risks, need drugs for thin blood
• heart transplant

  a heart is replaced with a healthy donor pros- long term solution cons-donor shortage, lifelong medication
• define the term health

  state of physical,mental and social well-being
• communicable disease

  infectious disease that is caused by bacteria,fungi + virus
• non-communicable

  cant spread between one another
• what is cancer?

  Abnormal cell growth forming a tumour
• benign tumour

  growth of cells in 1 area-usually membrane
• malignant tumour

  invades other tissues