Week 10
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Respiration
Physical process - exchange of CO2 and O2 Chemical process - generation of E
Types of respiration
• Direct skin diffusion • Gills • Trachea (network of tubes open to the outside) • Lungs all have diffusion into the blood vessels
Diffusion
Needs a large surface area (relative to organism volume), thinness, moisture Little to no energy input
Lung respiration passageway
Thorax expands to draw air in, oxygen passes through alveoli, diffuse into capillaries, RBC grab them While CO2 does the opposite
Most efficient respiration
Avian So they get enough oxygen while flying
Spiracles
Openings in trachea
Factors that affect respiration
Ontogeny, stress/activity, temp, pH, health, muscles, pollution