Circulatory System Flashcards
Worms have no heart chambers but _ pairs of heart like organs
5
5 pairs of heart like organs in worms called _ pump blood around body
Aortic arches
Vertebrates can have either a _ or a _ circulatory system
Single
Double
In single circulatory system, blood _ just once in complete cycle
Passes through heart
In double circulatory system, blood passes through heart once after it has been to lungs and again after _
Has been sent around body
(Humans)
Capillaries form large networks called _ around tissues and organs
Capillary beds
Mammals and _ have double circulatory system
Birds
Fish single circulatory system blood pumped in single loop from heart to gills where it picks up oxygen on way to _
Rest of body
Amphibians have double system but _ mixes in heart before being pumped around body (2)
Oxygen-poor blood
Oxygen-rich blood
Smaller arteries called _
Arterioles
Arreries carry _ away from heart
Oxygen-rich blood
Arteries become increasingly small until they join _
Capillaries
Veins carry _ towards heart
Oxygen-poor blood
