Circulatory System

1
Circulatory System

• Single Pump, Single Circuit
• Heart, Gills, Body, Heart
• Four Chambered Heart
• sinus venosus
• atrium
• ventricle
• conus or bulbus arteriosus

Gills
Body
Heart
sinus venosus
2
Circulation
dorsal aorta
Teleost
efferent branchial artery
afferent branchial artery
ventral aorta
Heart
Lungfish
Lung
gills
Heart
3
Hemoglobin (or not)
Perciformes Notothenioidei Channichthyidae
4
Hemoglobin

• 95 of O2 bound to hemoglobin
• Monomeric Hemoglobin
• hagfish and lampreys
• Tetrameric Hemoglobin
• all other fishes

5
Oxygen Affinity
cyprinid
salmonid
P50
saturation
partial pressure of oxygen (pO2)
6
What Affects O2 Affinity?

• pH
• partial pressure of CO2
• temperature
• organic phosphates (ATP, GTP)

7
Root and Bohr Effects
pH
8.0
7.5
7.2
saturation
partial pressure of oxygen (pO2)
8
O2 Loading and Unloading
Gills High O2 Low CO2
Tissue Low O2 High CO2
Perciformes Pomacanthidae Pomacanthus navarchus
9
Temperature