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Learning Check-List
Human Ecological Niche
Discuss the ecological niche of humans
Explain the mechanims of the tidal gas exchange system in humans
Compare and contrast the advantages and limitations of this system
Tasks - Milestone #2
Engage with the videos and notes below. In your portfolio of learning complete the following tasks. It is important to paraphrase in your own words, and include the URL's and any other resources you used in your reference list. So that they are there ready for your final assessment.
1.Complete sciPAD pgs: 52-53
2.Summarise the ecological niche of humans, including the metabolic demands
3. Summarise the mechanisms for ventilation and gas exchange in humans
4. Summarise the advantages and limitations of this type of gas exchange system for humans in their ecological niche
Watch this fantatic video covering the entire human gas exchange system from a NZ teacher. Everything you need to know for this section of your report.
Taxonomy is the scientific study of naming, defining and classifying groups of biological organisms based on shared characteristics. Mammals are an example of a taxonomic group, and humans are an example of a mammal.
Thinking back to your ecology learning, you will remember that an ecological niche is the functional position of a species in an ecosystem. You need to write about the ecological niche of humans in your report and relate this back to the adaptations of the gas exchange system in humans.
HUman Ventilation
HUman Ventilation
Watch this video to deppen your understanding of ventilation in humans. Remember ventilation is the physical act of getting O2 into the body and to the lungs and CO2 out of the body via the lungs. Make sure you include all the key structures involved with ventilation in your report and how they work together to ventilate the gas exchange system in humans.
Adaptations to Support Successful Ventilation
Adaptations to Support Successful Ventilation
The diaphragm and intercostal muscles drive the process of ventilation. Without these muscles, there's nothing causing oxygen poor air to go out and oxygen rich air to come into the lungs.
The diaphragm and intercostal muscles drive the process of ventilation. Without these muscles, there's nothing causing oxygen poor air to go out and oxygen rich air to come into the lungs.
The trachea and bronchi are held open by cartilage rings. These rings ensure that these structures remain open to allow air in and out continuously. They are similar to the rings on a vacumme cleaner hose, without these the pipe would collapse.
The trachea and bronchi are held open by cartilage rings. These rings ensure that these structures remain open to allow air in and out continuously. They are similar to the rings on a vacumme cleaner hose, without these the pipe would collapse.
HUMAN GAS EXCHANGE
Watch this video to get an overview of the key structures of the entire system and the mechanisms of gas exchange within the lungs. You need to discuss all the structures and how they work (mechanims) thoroughly in your final report.
Specific Adaptations of The Human gas exchange surface
Specific Adaptations of The Human gas exchange surface
Think about the characteristics of a successful gas exchange system from milestone #1
How is the gas exchange surface (alveoli) adapted to ensure a large surface area for diffusion?
How is the gas exchange surface adapted to ensure adequate moisture for the diffusion of O2 and CO2 ?
How is the gas exchange surface adapted to ensure minimum diffusion distances for O2 and CO2 ?
What are the adaptations to ensure that there is a large concentration gradient between the gas exchange surface and the trasport system (blood)
What are the adaptations to ensure that there is a transport system for the gases O2 and CO2 to and from the gas exchange surface?
Other considerations - what other adaptations ensure success within the terrestrial niche, e.g.: dry air and exposure to pathogens (micro-organisms such as bacteria, viruses and fungi that cause disease).
ADVANTAGES & DISADVANTAGES
Watch this video to help you summarise the advantages and disadvantages of the human tidal system for gas exchange in your milestone. Use the summaries below to ensure you have covered all of the key aspects for the tidal - lung system in humans.
SUMMARY OF ADVANTAGES
SUMMARY OF ADVANTAGES
SUMMARY OF DISADVANTAGES
SUMMARY OF DISADVANTAGES
SHEEP dissection
SHEEP dissection
If time permit we will carry out a lung dissection as a class. We will use sheep lungs as a model of our own. Watch this video to get an idea of what this will be like. The dissection is not compulsory, so please let me know if you do not wish to do this.
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