1 Respiratory system Function: • Gas exchange with environment • Exchange CO 2 for O 2 depends on: Diffusion ~ SA x gradient distance Encouraging diffusion • surface area - gill lamellae, infolding lamprey X-section Encouraging diffusion • gradient - counter-current exchange of gills, tetrapod ventilation Encouraging diffusion • distance across - thin walls of capillaries, thin skin for cutaneous respiration. Cell thickness at aveoli
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Respiratory system
Function:
• Gas exchange with environment
• Exchange CO2 for O2 depends on:
Diffusion ~ SA x gradient
distance
Encouraging diffusion
• surface area - gill lamellae, infolding
lamprey X-section
Encouraging diffusion
• gradient - counter-current exchange of gills, tetrapod ventilation
Encouraging diffusion
• distance across - thin walls of capillaries, thin skin for cutaneous respiration.
Cell thickness at aveoli
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Fish respiratory systems Development of internal gills
• Ectoderm meets endoderm
Fish respiratory anatomy
• Lamprey, Chondrichthyes, Osteoichthyes
Countercurrent exchange
80-95 of O2 taken up
Osmotic issues may cause fish to not ventilate or exchange
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Ventilation mechanics –Water flows over gills via suction and