circulatory system - the heart Flashcards
1
Q
what is the circulatory system made up of
A
heart
blood vessels
blood
2
Q
what is a double circulatory system
A
two circuits joined together
3
Q
what happens in the first circuit
A
heart pumps deoxygenated blood to lungs
4
Q
what happens in the 2nd circuit
A
the heart pumps oxygenated blood around all other organs
5
Q
how many chambers does the heart have
A
4
6
Q
what are the walls of the chambers made from
A
mostly muscle tissue
7
Q
what does the valve do
A
stops blood backflow
8
Q
the heart needs its own supply of ….
A
oxygenated blood
9
Q
where does the heart gets its supply of oxygenated blood from
A
coronary arteries
10
Q
where are coronary arteries
A
branched off the aorta and surrounds the heart
11
Q
what acts as a pacemaker in the heart
A
group of cells in the right atrium wall
