alveoli. Gas Exchange Respiratory Systems. elephant seals. gills. food. O 2. ATP. CO 2. respiration for respiration. 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.
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High surface area?High surface area!Where have we heard that before?
external systems with lots of surface area exposed to aquatic environment.
Hemocyanin: uses copper instead of iron to carry O2.
moist internal respiratory tissues with lots of surface area
Why does it workcounter current?Adaptation!
Why don’t land animalsuse gills?
Why is this exchangewith the environmentRISKY?
O2Breathing and Homeostasis
% oxyhemoglobin saturation
More O2 delivered to tissues
PO2 (mm Hg)O2 dissociation curve for hemoglobin
Effect of pH (CO2 concentration)
Why wouldmother’s Hb give up its O2 to baby’s Hb?
What is the adaptive advantage?
2 alpha & 2 gamma units