Dissecting gas exchange systems

• What is the purpose of dissecting animals like fish and mice?

  To better understand their anatomy
• What ethical issue is associated with dissections?

  Morally wrong to kill animals unnecessarily
• What type of animals are often used for dissections in schools?

  Animals already killed for their meat
• What concerns exist regarding the treatment of animals used for dissections?

  They may not be raised humanely
• What should be ensured for animals raised for dissection?

  They are looked after properly
• What are the steps to dissect a large insect humanely?

  1. Fasten the insect to a dissection tray
  2. Cut open the abdomen to examine tracheae
  3. Fill abdomen with saline solution
  4. Observe tracheae under an optical microscope
• Why should a student not inflate lungs by blowing into them?

  It can introduce bacteria and cause contamination
• What is one safety precaution when inflating lungs?

  Use a bicycle pump instead of mouth
• What should a student expect to see after inflating the lungs?

  The lungs will expand visibly
• Where should a student cut to open the trachea?

  At the base of the trachea
• How can you ensure dissecting tools are safe to use?

  Check for sharpness and cleanliness
• Name two ethical issues regarding dissections.

  Unnecessary killing and inhumane treatment