, ● Blood flows through the heart once for each complete circuit by flowing through 2
sets of capillaries
1. In gills for exchange of gases
2. To body for exchange of substances
- Low blood pressure = blood returns slowly to the heart , limiting efficiency of system
and activity levels
FISH still active :
- Countercurrent gas exchange : absorb more oxygen from water
- Body weight supported by water
- No thermoregulation as same water and temperature
= reducing metabolic demands on their bodies
DOUBLE
● Blood flows through heart twice for each complete circuit (to lungs, then to rest of
body)
+ High blood pressure as it passes through 1 set of capillaries = fast blood flow
2
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