lungs have large gas exchange SA
- larger animals have complex blood systems + lungs to provide larger SA for efficient diffusion
- alveoli: gas exchange takes place in tiny air sacs
alveoli adaptions for efficiency
- sigle thin layer - faster due to short distance for molecules
- higher concen in alveoli than in blood - allows faster diffusion due to bigger concen. diff. due to blood carrying away O2
- fully permeable walls - O2 + CO2 pass easily through cell membranes to epithelial cells
Comments
No comments have yet been made