Oxygen Delivery Flashcards
Features of capillaries
Smallest blood vessels
thin walls for efficient gas exchange
oxygen moves into respiring cells efficiently
CO2 moves into the bloodstream
at capillaries there is a drop in pressure as the network of hers resistance to bloodflow
Features of a single circulatory system
Fish have single circulatory systems
Blood passes through the two chambered heart once per circuit
Primitive and relatively inefficient method
Features of a double circulatory system
Can be complete or incomplete
Blood passes through the heart twice per circuit
Blood is pumped to both lungs and body capillary network at high pressure which is more efficient
What type of animals have an incomplete double circulatory system?
Reptiles and amphibians
What type of animal has a complete double circulatory system?
Birds and mammals
Features of an incomplete double circulatory system
Only one ventricle
Some oxygenated and deoxygenated blood will mix
Reptiles overcome this by having a septum which partially divides the ventricle
Amphibians overcome this by having moist skins which allow gas exchange so the blood returning to the heart is already partly oxygenated
Features of a complete double circulatory system
Two ventricles which are completely separated by septum
No mixing of blood
Most advanced and efficient
Allows Endotherms to deliver large quantities of oxygen to respiring tissues
Adaptations of birds oxygen delivery systems
Most efficient
Have lungs for gas exchange with para bronchi instead of alveoli
They have air sacks flowing through the lungs so the air is forced in One Direction
Adaptations of fish oxygen delivery systems
Gas absorption in fish occurs in the gills
Adaptations of amphibians oxygen delivery systems
Normally exchange gases through their skin and mouth cavities
Small surface area in lungs with no alveoli as they only use their lungs during strenuous activity
Adaptations of reptiles and mammals oxygen delivery systems
System of branching tubes that ended many alveoli that have a thin moist lining and a large surface area
Why are alveoli efficient?
Thin walls quick efficient gas exchange
Moist Organ, dissolves glasses
Good blood supply means lots of opportunity for gas exchange
