alveoli. Gas Exchange Respiratory Systems. elephant seals. gills. food. O 2. ATP. CO 2. Why do we need a respiratory system?. Need O 2 in for aerobic cellular respiration make ATP Need CO 2 out waste product from Krebs cycle. Gas exchange.
external systems with lots of surface area exposed to aquatic environment
moist internal respiratory tissues with lots of surface area
Exchange tissue:spongy texture, honeycombed with moist epithelium
O2Breathing and Homeostasis
What is the adaptive advantage?
2 alpha & 2 gamma units