valves Flashcards
1
Q
what do valves do
A
stop blood from flowing backwards
2
Q
what happens to blood when it leaves a heart chamber
A
passes through a valve
3
Q
how many directions does a valve allow blood through
A
one
4
Q
where are valves also located
A
in veins
5
Q
why are valves needed in veins
A
because blood flows at a low pressure through veins
