Circulatory System Flashcards
Name the two types of systems
Open and closed circulatory systems
Open circulation system eg insects
Heart pumps blood into vessels that are open ended
Closed circulation system
Blood remains in a Continuous system of blood vessels
Eg humans
Advantages of closed c s
Blood can be pumped faster
Blood flow rate to different organs can be changed
Three parts of human circulatory system
Heart
Blood vessels
Blood
What are the main blood vessels
Veins and capillaries
Artie’s carry blood
Away from heart
Arteries have
Thick elastic walls and a narrow lumen
Veins carry blood
Under low pressure towards the heart
Veins have
Valves
Thin wall
Wide lumen
Valves prevent
Backflow
Artérioles connect
Arteries to capillaries
Venules connect
Capillaries yo veins
Capillaries connect
Arterioles to venules
Capillaries have a thin permeable Wall which
Allows easy exchange of materials with cells
Role of muscle
Expand to allow increased blood flow through the vessel
Role of elastic fiber
Bring blood vessel back to shape
Name the circuits in the two circuit circulation
Systemic and pulmonary circuit
Systemic
Goes around whole body and back to heart
Pulmonary
Goes to lungs for oxygen and back to heart
Advantages of a double circulation system
Separation of oxygen rich and oxygen poor blood
Portal system is a
Blood pathway that begins and ends in capillaries
Portal system does not connect with
The heart
Hepatic portal vein connects
Ileum to liver
What go into the lymph system
Fats
