| Site of gas exchange in mammals | - Lungs |
| Why are lungs located inside the body | - Air is not dense enough to support + protect these delicate structures
- The body as a whole would lose a lot of water + dry out |
| Why mammals need to absorb large amount of oxygen and release a large amount of CO2 from lungs | - Relatively large organisms, large volume of living cells
- Maintains a high body temperature, related to having high metabolic + respiratory rates |
| Adaptation of the lungs for gas exchange | - Air enters trachea
- Trachea divides into two bronchi, leading to lungs
- Bronchi divides into bronchioles
- Bronchioles have air sacks, alveoli
- The ribcage, intercostal muscles and diaphragm work together to move air in + out |
| Lung dissection practical | - Messy, wear lab coat
- Dissecting tools, scalpel, dissecting scissors
- Lay lungs on cutting board
- Can see trachea and 2 bronchi
- Inflate lungs using foot pump
- Examine different tissues |
| Ethical issues involving dissecting animals | - Unnecessary killing, but some already killed - not just for dissection
- Animals used for dissections are not always raised in a humane way |
