Photosynthesis

• The light dependent cycle uses the energy to remove electrons from light to produce oxygen gas and reducing power.
• Pathogen


  Tiny microorganisms that infect or invade the body and attack its cells and tissues
• Types of pathogens


  • Bacteria
  • Rickettsiae
  • Fungi
  • Protozoans
  • Certain types of worms
  • Viruses
• Diseases caused by the direct or indirect spread of pathogens from one person to another are called communicable diseases
• Bacteria


  One-celled microscopic organisms that are among the most widespread of living things
• Saprophytes


  Bacteria that digest non-living food materials such as milk and meat
• Parasite


  A microorganism that feeds on a living plant or animal
• Toxin Bacteria produce a certain poison
• Botulism is a food poison caused by Toxin Bacteria
• Once Toxin Bacteria enter the body through a wound, they can cause tetanus or lockjaw
• Other bacteria can cause pneumonia
• Resident Bacteria


  Bacteria that live in the human mouth, intestines, and on the skin, helping protect from harmful bacteria
• Lactobacilli, found in the gastro-intestinal tract, produce lactic acid from simple carbohydrates
• Coliform bacilli, found in the intestines, help break down carbohydrates and combat disease-causing bacteria
• Resident bacteria cause infections when they move from the original resident to another part of the body
• Example: When bacteria in the mouth move to the ear, they can cause an ear infection
• Rickettsiae


  Organisms considered intermediate between a virus and a bacterium, requiring living cells to grow and multiply
• Rickettsiae grow in the intestinal tracts of insects, which carry them to their human hosts
• Blood-sucking insects such as lice, mites, and ticks carry Rickettsiae
• Pathogen


  Tiny microorganisms that infect or invade the body, attacking its cells and tissues. Includes bacteria, rickettsiae, fungi, protozoans, certain types of worms, and all viruses
• Diseases caused by the direct or indirect spread of pathogens from one person to another are called communicable diseases
• Bacteria


  One-celled microscopic organisms, some of which are saprophytes (digest non-living food materials) and parasites (feed on living plants or animals)
• Toxin Bacteria


  Produce certain poisons, causing diseases like botulism, tetanus, lockjaw, and pneumonia
• Resident Bacteria


  Live in the human mouth, intestines, and on the skin, helping protect from harmful bacteria. Can cause infections when they move from their original location to another
• Resident Bacteria


  • Lactobacilli, Coliform bacilli
• Resident Bacteria infections


  When resident bacteria move from their original location to another, they can cause infections. For example, bacteria in the mouth moving to the ear can cause an ear infection
• Rickettsiae


  Organisms considered intermediate between a virus and a bacterium, growing in the intestinal tracts of insects and requiring living cells to grow and multiply. Carried by blood-sucking insects like lice, mites, and ticks
• PATHOGEN

  Many of the most common diseases are caused by tiny microorganisms called PATHOGEN. Pathogen infects, or invades the body and attacks its cells and tissues. Some bacteria, rickettsiae, fungi, protozoans, certain types of worms, and all viruses are pathogens. Diseases caused by the direct or indirect spread of pathogens from one person to another are called communicable diseases,
• Bacteria


  One-celled microscopic organisms that rank among the most widespread of living things
• A single grain of soil may contain over 100 million bacteria
• Most bacteria do not cause disease
• Bacteria


  • Must have a food supply
  • Suitable temperature
  • Moisture
  • Darkness
• Types of bacteria


  • Saprophytes
  • Parasites
• Saprophytes


  Bacteria that digest non-living food materials such as milk and meat
• Parasites


  Bacteria that feed on a living plant or animal
• Host


  The plant or animal that the parasite feeds on