Gas exchange in fish

Structure of gills:

• Made up of gill filaments
• Is a specialised internal gas exchange surface
• Gill filaments are stacked up into a pile
• At right angles to the filaments are gill lamellae - increase the surface area of the gills

How fish gills are adapted for efficient gas exchange:

• Have a large surface area to volume ratio provided by lamellae
• This increases diffusion
• As there…