11-respiration-3[1]

11-respiration-3[1] - Fish gills use countercurrent flow to...

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Fish gills use countercurrent flow to get oxygen, a more efficient method than used in human alveoli (which lack countercurrent flow). Why might this be? 1. Water contains less oxygen than air 2. Fish metabolic rates are higher than human MR’s 3. Fish diffusion distances are higher
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Welcome back • Today we’ll continue with respiration – Osmoregulation will be our next unit • Tests are not graded –So r ry : ( • Coming up: – Writing project 2 due Wednesday April 23 – Today’s lab is the Animal Diversity lab – • You must have the entire lab printed (yes, it’s long)
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Outline of respiration unit 1. General principles of respiration Modeling movement of gasses 2. Human respiration Anatomy Transport of gasses in the blood 3. Respiration in water 4. Other animals’ respiration 5. Other organisms’ respiration •P l a n t s !
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Types of breathing structures
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Å Inhalation Å Å Exhalalation (note, air from inhalation above is still in the lungs) Bird inhales again! Air from the first breath now moves to the anterior air sacs It takes 2 breaths to cycle air through a bird’s lungs! Bird lung air flow (Blue shading represents the air from a single breath)
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Bird lungs
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Amphibians • Use all three major types of respiration (to varying degrees) – Lungs – Gills – Cutaneous (across the skin)
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What have we talked about? •M a m m a l s •F i s h •B i r d s • Amphibians • What more could there be to say about animal respiration?
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Insects Trachea
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Insect Airflow • Spiracles – Open to the outside – Can be “gated” • Trachea – Large distribution tubes • Tracheoles – Small tubes that lead to each cell Spiracle Tracheal tube (a) (b) (c) Tracheole Tracheal tube Epithelial cell O 2 Spiracle CO 2 Muscle
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Overview of Tracheal System
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Diffusion or convection • A big question – are insect trachea just diffusive, or do insects use convection (forced air movements) • Some insects are pure diffusive – Especially small ones • Some insects use convection
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Methods of convection •A i r s a c s – Can work like baffles – NOT in all insects • Coordination of spiracular opening – Can get a net current moving through • Autoventillation – As insects move or fly the muscles contracting around the trachea cause air movement
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What do trachea look like?
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Tracheoles in Flight Muscle Tracheole Mitochondria Z lines Sarcomeres Endomysium Image by Scott Kirkton
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Diffusive Oxygen Delivery
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Oxygen Delivery by Tracheole Mitochondrion Z-line Tracheoles Image by Scott Kirkton
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If I increased the amount of oxygen surrounding an insect (e.g. put them in a 30% oxygen environment), what effect would that have?
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This note was uploaded on 11/11/2011 for the course ECON 100 taught by Professor Chandle during the Spring '11 term at UC Irvine.

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11-respiration-3[1] - Fish gills use countercurrent flow to...

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