11/06/2015 1 Bio 2.3 Demonstrate understanding of adaptation of plants or animals to their way of life -> taxonomy -> wideshot of systems and diversity -> adaptations -> insects, mammals and fish -> review/ making connections Phylogenetics Coz life is amazing but can be hard to get your head around Kingdom: Animalia Phylum: Chordates Class: Mammals Order: Primates Family: Hominins genus: Homo Species: sapiens Phylum Cnidaria Phylum Mollusca
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11/06/2015
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Bio 2.3 Demonstrate understanding of adaptation of plants or animals to their way of life
-> taxonomy-> wideshot of systems and diversity-> adaptations-> insects, mammals and fish-> review/ making connections
PhylogeneticsCoz life is amazing but can be hard to get your head around
This unit we will be focussing on 3 taxonomic groups.
Phylum Arthropoda – Class insecta
• jointed limbs
• three pairs of legs
• often have wings
• compound eyes
• Tracheal gas exchange
Phylum Chordata – Class Fish (Pisces)
• Aquatic
• Scales (usually)
• Gills for gas exchange
• Closed blood system
Phylum Chordata – Class Mammalia
• Young are fed milk
• Hairy not furry
• Large brain
• 3 groups – Monotremes, Marsupials
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Adaptation
An adaptation is…
The adjustment of behaviour or physiology of an organism to become more suited to their environment and lifestyle.
Why adapt?
To survive!
An environment tends to eliminate living things that are not suited to it. A plant that was not adapted to conserve moisture would soon die in the desert.
“According to Charles Darwin's theory of evolution by natural selection, the organisms adapt to their environment to become better fitted to survive and passing their genes on to the next generation. “
Adapting to look like something you’re not
Adapting to the cold Adapting to the heat
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People do it too Adjusting to different air supply issues
In order to operate in extreme environments, some animals have evolved different types of blood composition: the sperm whale and the bar-headed goose of Asia. Both these species have an uncanny ability to store a lot more oxygen in their blood cells than other animals.
Like a fish that can breathe air
• In tropical and equatorial areas• Massive seasonal changes in water levels• Lungfish (Dipnoi) create a mucus sack to
protect themselves through the drought.• Some species of catfish and eel not only
breathe air, but also travel on land between pools.
• Take oxygen from the air through the use of a specialized area of their intestines.
…and some species get really clever….
Gas exchange + Respiration + Breathing
Your mission
• What is the purpose of gas exchange?
• Name the respiratory gases
• How are gasses exchanged with the environment?
• Contrast air and water in terms of the challenges they present for gas exchange
1. What is the purpose of gas exchange?
The purpose of gas exchange is to exchange oxygen and carbon dioxide with the atmosphere.
Oxygen is required by all the cells of the body for respiration, the process in which energy is extracted from the glucose in the food an animal eats. The waste products of respiration are CO₂ and water.
CO₂ leaves the body through the same process that oxygen is absorbed, only in reverse. Gas exchange absorbs O₂ from the environment and releases CO₂.
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2. Name the respiratory gasses
• O₂ / Oxygen
• CO₂/ Carbon dioxide
3. How are gases exchanged with the environment?
Gases are exchanged with the environment through the process of diffusion. First the gasses in the environment need to reach the surfaces across which diffusion can occur, this usually happened via breathing.
• Diffusion across a semi-permeable membrane and into the body
Transport system to the cells
Transport of waste products out of the body
Features of a gas exchange surface
4. Contrast air and water in terms of the challenges they present for gas exchange
• O₂ content is higher in air than water
• What does this mean for the animal ?(Size of GE surfaces, Energy consumption, efficiency of the process).
• In the water surfaces are less likely to dry out (what mechanisms do land animals need to prevent this?)
Situations where the rule is different – high altitude or stagnant water, and what this means for the animal (Lower energy use, ability to store O₂ etc…).
Your mission• Read ‘Gas exchange’ page 211
Write definitions for:1. Respiration2. Gas exchange3. Breathing4. DiffusionConsider the role of each of these in gas exchange for an organism
• Do question 1 on page 217• Read ‘mammals” and “Breathing” 214-217
How is the air up there?
Mountain Altitude Oxygen content
Sea level 0m ~20%
Mt Cook 3,724 m ~13%
Tibetan plateau 4,000m ~12%
Kilimanjaro 5,791m ~10%
Mt Everest 8,839m ~6.8%
Oxygen in the air can be affected by altitude and temperature. Higher altitude = less dense = less oxygen molecules in a breathWarmer = less dense = less oxygen molecules in a breath
http://www.higherpeak.com/altitudechart.html
What does it mean?
• Mountain climbers need specialised breathing equipment at very high altitudes
• Over time the human body can adapt to some changes:
haemoglobin concentrations
Heart rate
• And some people are equipped to adapt better than others
Tibetan Yak• Larger lungs and heart• More efficient transport of
O₂• More efficient metabolism• 3,000 - 5,000m• Long term adaptation
Animals that need more oxygen
Big: Elephant
• Breathes 310L air/ minute (6 in Humans)
• Huge lungs!
• Where are the lungs? How are they housed?
How are they held up?
• Circle of skin separating trunk from lungs.
• Need to drink lots!
Animals that need more oxygen
Fast: Cheetah
• Fastest land animal (120km/hr)
• Takes lots of energy
• Enlarges nostrils, sinuses, lungs,
• Enlarged heart = increased blood flow
• 60-150 breaths per minute (2x humans)
• Fast muscles don’t store oxygen well = need a good supply
Your mission
Use your books (pg211 onwards) and what we have discussed today to make notes on the following
1. List the features required for diffusion
2. Describe the gas exchange system of a mammal.
3. Describe one case in which this system may need to be specialised (adapted). Include how the system is specialised and relate it to the environmental conditions it is specialised to.
Dissection of a cow pluck:
Observe • Thin• Moist • Large surface area
• Trachea• Bronchus, bronchiole• Rings of cartilage• Lung• Alveoli• And consider how it relates
to the circulatory system
Draw a diagram of a mammal gas exchange system.
• Include the features you observed
• Annotate your diagram with how some of these features are adapted to a mammals way of life
• Refer to 214-216 in your textbook for more info
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Thinking points
• What are the features required of a gas exchange system?
• Why are the lungs so bloody?
• Any adaptations of a mammal system to help them with gas exchange?
• Annotated diagram of a mammal respiratory system – what is an annotated diagram?
Have you?
1. Listed the features required for diffusion.
2. Describe the gas exchange system of a mammal.
3. Describe one case in which this system may need to be specialised (adapted). Include how the system is specialised and relate it to the environmental conditions it is specialised to.