KA3- Circulatory Systems Flashcards
What type of circulatory systems do vertebrates have?
Closed circulatory systems where the blood is contained in a continuous circuit of blood vessels
What keeps a vertebrate’s circulatory system going?
A muscular pump (heart)
Where does the heart pump blood to?
Large vessels that branch into smaller and smaller vessels then to capillaries
What do capillaries do?
Leak
Are capillaries permeable?
Yes
Why are cells bathed in tissue fluid?
Allows exchange of materials
What type of circulatory system do fish have?
A single circulatory system
What happens to the blood in fish?
The blood passes through the two chambered heart only once for each circuit of the body
When does pressure drop in closed circulatory systems?
When blood passes through the capillaries
Why does pressure drop in closed circulatory systems?
The narrow tubes resist the flow of blood and the fluid leaks out of them as they are permeable
What type of pressure does blood flow to the gills?
High pressure
When do fish lose most of their pressure?
In the gill capillaries before it arrives at the body capillaries at a low pressure
How many times dies the blood pass through the heart in double circulation?
Twice for each competed circuit of the body
How many ventricles are there in an incomplete double circulatory system?
One
Does p2 and de-o2 blood mix in incomplete double circulatory systems?
Yes
What has oxygenated blood?
Lungs
What has deoxygenated blood?
The body
Where is the incomplete double circulatory system found?
Ectothermic vertebrates with a lower metabolic rate
In reptiles, how is yeh single ventricle partly divided by?
A septum
The heart has what in complete double circulatory systems?
Two atria and two ventricles
How are the two atria and the two ventricles separated?
A septum
Does blood mixing occur in complete double circulatory systems?
No
What kind of pressure is oxygenated blood pumped at in complete double circulatory systems?
High pressure
Where are complete double circulatory systems found?
Endothermic vertebrates (birds and mammals)
Why are complete double circulatory systems good for organisms with high metabolic rates?
It delivers large quantities of oxygen to respiring tissues
What has an incomplete double circulatory system?
Amphibians and reptiles
